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    <button id="icon-button-b06fd45c-63f9-4aa1-afd8-d7920f1d1229" aria-labelledby="tooltip-c896c84f-ba52-40ab-a0bf-0d58285406ad" type="button" data-view-component="true" class="Button Button--iconOnly Button--invisible Button--medium flash-close js-flash-close">  <svg aria-hidden="true" data-component="Octicon" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-x Button-visual">
    <path d="M3.72 3.72a.75.75 0 0 1 1.06 0L8 6.94l3.22-3.22a.749.749 0 0 1 1.275.326.749.749 0 0 1-.215.734L9.06 8l3.22 3.22a.749.749 0 0 1-.326 1.275.749.749 0 0 1-.734-.215L8 9.06l-3.22 3.22a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L6.94 8 3.72 4.78a.75.75 0 0 1 0-1.06Z"></path>
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</button><tool-tip id="tooltip-c896c84f-ba52-40ab-a0bf-0d58285406ad" for="icon-button-b06fd45c-63f9-4aa1-afd8-d7920f1d1229" popover="manual" data-direction="s" data-type="label" data-view-component="true" class="sr-only position-absolute">Dismiss alert</tool-tip>


  
</div>
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  <div id="start-of-content" class="show-on-focus"></div>








    <div id="js-flash-container" class="flash-container" data-turbo-replace>





  <template class="js-flash-template">
    
<div class="flash flash-full   {{ className }}">
  <div >
    <button autofocus class="flash-close js-flash-close" type="button" aria-label="Dismiss this message">
      <svg aria-hidden="true" data-component="Octicon" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-x">
    <path d="M3.72 3.72a.75.75 0 0 1 1.06 0L8 6.94l3.22-3.22a.749.749 0 0 1 1.275.326.749.749 0 0 1-.215.734L9.06 8l3.22 3.22a.749.749 0 0 1-.326 1.275.749.749 0 0 1-.734-.215L8 9.06l-3.22 3.22a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L6.94 8 3.72 4.78a.75.75 0 0 1 0-1.06Z"></path>
</svg>
    </button>
    <div aria-atomic="true" role="alert" class="js-flash-alert">
      
      <div>{{ message }}</div>

    </div>
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</div>
  </template>
</div>


    






  <div
    class="application-main "
    data-commit-hovercards-enabled
    data-discussion-hovercards-enabled
    data-issue-and-pr-hovercards-enabled
    data-project-hovercards-enabled
  >
        <div itemscope itemtype="http://schema.org/Code">
    <main id="gist-pjax-container">
      

  <div class="gist-detail-intro gist-banner tmp-pb-3">
    <div class="text-center container-lg tmp-px-3">
      <p class="lead">
        Instantly share code, notes, and snippets.
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<div class="gisthead pagehead pb-0 tmp-pt-3 tmp-mb-4">
  <div class="px-0">
    
  
<div class="tmp-mb-3 d-flex tmp-px-3 tmp-px-md-3 tmp-px-lg-5">
  <div class="flex-auto min-width-0 width-fit tmp-mr-3">
    <div class="d-flex">
      <div class="d-none d-md-block">
        <a class="mr-2 flex-shrink-0" data-hovercard-type="user" data-hovercard-url="/users/alandipert/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/alandipert"><img class="avatar avatar-user" src="https://avatars.githubusercontent.com/u/26024?s=64&amp;v=4" width="32" height="32" alt="@alandipert" /></a>
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        <div class="d-flex flex-row width-full">
          <h1 class="wb-break-word f3 text-normal mb-md-0 mb-1">
            <span class="author"><a data-hovercard-type="user" data-hovercard-url="/users/alandipert/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="/alandipert">alandipert</a></span><!--
                --><span class="mx-1 color-fg-muted">/</span><!--
                --><strong itemprop="name" class="css-truncate-target mr-1" style="max-width: 410px"><a href="/alandipert/1263783">kahn.clj</a></strong>
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  <ul class="d-md-flex pagehead-actions float-none mr-2">
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  <div class="d-inline-block d-md-none ml-auto">
    <action-menu data-select-variant="none" data-view-component="true" class="flex-self-start ml-auto tmp-ml-auto d-inline-block">
  <focus-group direction="vertical" mnemonics retain>
    <button id="gist_options-button" popovertarget="gist_options-overlay" aria-controls="gist_options-list" aria-haspopup="true" aria-labelledby="tooltip-21dbf3cb-cb9c-4848-ab2d-9f08547279b7" type="button" data-view-component="true" class="Button Button--iconOnly Button--secondary Button--small">  <svg aria-hidden="true" data-component="Octicon" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-kebab-horizontal Button-visual">
    <path d="M8 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3ZM1.5 9a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Zm13 0a1.5 1.5 0 1 0 0-3 1.5 1.5 0 0 0 0 3Z"></path>
</svg>
</button><tool-tip id="tooltip-21dbf3cb-cb9c-4848-ab2d-9f08547279b7" for="gist_options-button" popover="manual" data-direction="s" data-type="label" data-view-component="true" class="sr-only position-absolute">Show Gist options</tool-tip>


<anchored-position data-target="action-menu.overlay" id="gist_options-overlay" anchor="gist_options-button" align="start" side="outside-bottom" anchor-offset="normal" popover="auto" data-view-component="true">
  <div data-view-component="true" class="Overlay Overlay--size-auto">
    
      <div data-view-component="true" class="Overlay-body Overlay-body--paddingNone">          <action-list>
  <div data-view-component="true">
    <ul aria-labelledby="gist_options-button" id="gist_options-list" role="menu" data-view-component="true" class="ActionListWrap--inset ActionListWrap">
        <li rel="nofollow" data-hydro-click="{&quot;event_type&quot;:&quot;clone_or_download.click&quot;,&quot;payload&quot;:{&quot;feature_clicked&quot;:&quot;DOWNLOAD_ZIP&quot;,&quot;git_repository_type&quot;:&quot;GIST&quot;,&quot;gist_id&quot;:1263783,&quot;originating_url&quot;:&quot;https://gist.github.com/alandipert/1263783&quot;,&quot;user_id&quot;:null}}" data-hydro-click-hmac="c68d67be16b82e0962b486c979b047b68c231f13c05bd37c787b363d4b48c2ac" data-ga-click="Gist, download zip, location:gist overview" data-targets="action-list.items" data-item-id="download_from_gist_options" role="none" data-view-component="true" class="ActionListItem">
    
    
    <a tabindex="-1" id="item-1f9c0825-8c8e-4549-8fcb-d936bf991993" href="/alandipert/1263783/archive/11de850ddeff201330fbd1f78d2518c451fa509b.zip" role="menuitem" data-view-component="true" class="ActionListContent ActionListContent--visual16">
        <span class="ActionListItem-visual ActionListItem-visual--leading">
          <svg aria-hidden="true" data-component="Octicon" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-download">
    <path d="M2.75 14A1.75 1.75 0 0 1 1 12.25v-2.5a.75.75 0 0 1 1.5 0v2.5c0 .138.112.25.25.25h10.5a.25.25 0 0 0 .25-.25v-2.5a.75.75 0 0 1 1.5 0v2.5A1.75 1.75 0 0 1 13.25 14Z"></path><path d="M7.25 7.689V2a.75.75 0 0 1 1.5 0v5.689l1.97-1.969a.749.749 0 1 1 1.06 1.06l-3.25 3.25a.749.749 0 0 1-1.06 0L4.22 6.78a.749.749 0 1 1 1.06-1.06l1.97 1.969Z"></path>
</svg>
        </span>
      
        <span data-view-component="true" class="ActionListItem-label">
          Download ZIP
</span>      
</a>
  
</li>
</ul>    
</div></action-list>


</div>
      
</div></anchored-position>  </focus-group>
</action-menu>  </div>
  <ul class="d-md-flex d-none pagehead-actions float-none">


      <li>
          <a id="gist-star-button" href="/login?return_to=https%3A%2F%2Fgist.github.com%2Falandipert%2F1263783" rel="nofollow" data-hydro-click="{&quot;event_type&quot;:&quot;authentication.click&quot;,&quot;payload&quot;:{&quot;location_in_page&quot;:&quot;gist star button&quot;,&quot;repository_id&quot;:null,&quot;auth_type&quot;:&quot;LOG_IN&quot;,&quot;originating_url&quot;:&quot;https://gist.github.com/alandipert/1263783&quot;,&quot;user_id&quot;:null}}" data-hydro-click-hmac="1327fbd368319f7c9917ec9df8dc0ac21d3fffa47f39261fdbb8d295bcb871d8" aria-label="You must be signed in to star a gist" data-view-component="true" class="btn-with-count Button--secondary Button--small Button">  <span class="Button-content">
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    <path d="M8 .25a.75.75 0 0 1 .673.418l1.882 3.815 4.21.612a.75.75 0 0 1 .416 1.279l-3.046 2.97.719 4.192a.751.751 0 0 1-1.088.791L8 12.347l-3.766 1.98a.75.75 0 0 1-1.088-.79l.72-4.194L.818 6.374a.75.75 0 0 1 .416-1.28l4.21-.611L7.327.668A.75.75 0 0 1 8 .25Zm0 2.445L6.615 5.5a.75.75 0 0 1-.564.41l-3.097.45 2.24 2.184a.75.75 0 0 1 .216.664l-.528 3.084 2.769-1.456a.75.75 0 0 1 .698 0l2.77 1.456-.53-3.084a.75.75 0 0 1 .216-.664l2.24-2.183-3.096-.45a.75.75 0 0 1-.564-.41L8 2.694Z"></path>
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    <span class="Button-label">Star</span>
      <span class="Button-visual Button-trailingVisual">
          <span class="d-flex" aria-hidden="true"><span title="38" data-view-component="true" class="Counter">38</span></span>
          <span class="sr-only">(<span title="38" data-view-component="true" class="Counter">38</span>)</span>
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  </span>
</a><tool-tip id="tooltip-09f18f56-758c-4fb8-b656-dc66ef7b640f" for="gist-star-button" popover="manual" data-direction="n" data-type="description" data-view-component="true" class="sr-only position-absolute">You must be signed in to star a gist</tool-tip>

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            <a id="gist-fork-button" href="/login?return_to=https%3A%2F%2Fgist.github.com%2Falandipert%2F1263783" rel="nofollow" data-hydro-click="{&quot;event_type&quot;:&quot;authentication.click&quot;,&quot;payload&quot;:{&quot;location_in_page&quot;:&quot;gist fork button&quot;,&quot;repository_id&quot;:null,&quot;auth_type&quot;:&quot;LOG_IN&quot;,&quot;originating_url&quot;:&quot;https://gist.github.com/alandipert/1263783&quot;,&quot;user_id&quot;:null}}" data-hydro-click-hmac="9ae7a4b097c5641cf6cdd538b6660b92c67ec01543ce01aaacfc76553a914935" aria-label="You must be signed in to fork a gist" data-view-component="true" class="btn-with-count Button--secondary Button--small Button">  <span class="Button-content">
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    <span class="Button-label">Fork</span>
      <span class="Button-visual Button-trailingVisual">
          <span class="d-flex" aria-hidden="true"><span title="9" data-view-component="true" class="Counter">9</span></span>
          <span class="sr-only">(<span title="9" data-view-component="true" class="Counter">9</span>)</span>
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</a><tool-tip id="tooltip-209895a5-8eda-421d-8ba0-a2d333e58d1d" for="gist-fork-button" popover="manual" data-direction="n" data-type="description" data-view-component="true" class="sr-only position-absolute">You must be signed in to fork a gist</tool-tip>

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  <ul class="d-flex d-md-none tmp-px-3 mb-2 pagehead-actions float-none" >
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<div data-view-component="true" class="flex-items-center d-inline-flex">
    <select-panel data-menu-input="gist-share-url-sized-down" id="select-panel-7aa8db40-32b2-4216-8b05-ff5dda44f969" anchor-align="start" anchor-side="outside-bottom" data-menu-input="gist-share-url-sized-down" data-select-variant="single" data-fetch-strategy="local" data-open-on-load="false" data-dynamic-label="true" data-view-component="true" class="flex-shrink-0">
  <dialog-helper>
    <button id="select-panel-7aa8db40-32b2-4216-8b05-ff5dda44f969-button" aria-controls="select-panel-7aa8db40-32b2-4216-8b05-ff5dda44f969-dialog" aria-haspopup="dialog" aria-expanded="false" type="button" data-view-component="true" class="rounded-right-0 border-right-0 Button--secondary Button--small Button">  <span class="Button-content">
    <span class="Button-label">Embed</span>
  </span>
    <span class="Button-visual Button-trailingAction">
      <svg aria-hidden="true" data-component="Octicon" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-triangle-down">
    <path d="m4.427 7.427 3.396 3.396a.25.25 0 0 0 .354 0l3.396-3.396A.25.25 0 0 0 11.396 7H4.604a.25.25 0 0 0-.177.427Z"></path>
</svg>
    </span>
</button>

    <dialog id="select-panel-7aa8db40-32b2-4216-8b05-ff5dda44f969-dialog" aria-labelledby="select-panel-7aa8db40-32b2-4216-8b05-ff5dda44f969-dialog-title" data-target="select-panel.dialog" style="position: absolute;" data-view-component="true" class="Overlay Overlay-whenNarrow Overlay--size-small-portrait">
      <div data-view-component="true" class="Overlay-header">
  <div class="Overlay-headerContentWrap">
    <div class="Overlay-titleWrap">
      <h1 class="Overlay-title " id="select-panel-7aa8db40-32b2-4216-8b05-ff5dda44f969-dialog-title">
        Select an option
      </h1>
        
    </div>
    <div class="Overlay-actionWrap">
      <button data-close-dialog-id="select-panel-7aa8db40-32b2-4216-8b05-ff5dda44f969-dialog" aria-label="Close" aria-label="Close" type="button" data-view-component="true" class="close-button Overlay-closeButton"><svg aria-hidden="true" data-component="Octicon" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-x">
    <path d="M3.72 3.72a.75.75 0 0 1 1.06 0L8 6.94l3.22-3.22a.749.749 0 0 1 1.275.326.749.749 0 0 1-.215.734L9.06 8l3.22 3.22a.749.749 0 0 1-.326 1.275.749.749 0 0 1-.734-.215L8 9.06l-3.22 3.22a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042L6.94 8 3.72 4.78a.75.75 0 0 1 0-1.06Z"></path>
</svg></button>
    </div>
  </div>
  
</div>      <div data-view-component="true" class="Overlay-body p-0 tmp-p-0">
        <focus-group direction="vertical" mnemonics retain>
          <live-region data-target="select-panel.liveRegion"></live-region>
          <div data-fetch-strategy="local" data-target="select-panel.list" data-view-component="true">
            <div id="select-panel-7aa8db40-32b2-4216-8b05-ff5dda44f969-body">
                <action-list>
  <div data-view-component="true">
    <ul aria-label="Select an option options" id="select-panel-7aa8db40-32b2-4216-8b05-ff5dda44f969-list" role="listbox" data-view-component="true" class="ActionListWrap p-2 tmp-p-2">
        <li data-targets="action-list.items" role="none" data-view-component="true" class="ActionListItem">
    
    
    <button value="&lt;script src=&quot;https://gist.github.com/alandipert/1263783.js&quot;&gt;&lt;/script&gt;" data-hydro-click="{&quot;event_type&quot;:&quot;clone_or_download.click&quot;,&quot;payload&quot;:{&quot;feature_clicked&quot;:&quot;EMBED&quot;,&quot;git_repository_type&quot;:&quot;GIST&quot;,&quot;gist_id&quot;:1263783,&quot;originating_url&quot;:&quot;https://gist.github.com/alandipert/1263783&quot;,&quot;user_id&quot;:null}}" data-hydro-click-hmac="a510adfb4952d1d365388befa60c2c3e1f7e3e900b5c7360a5a4dafc5809776b" id="item-dc776cb3-c72f-4770-968d-6919066587df" type="button" role="option" aria-selected="true" data-view-component="true" class="ActionListContent">
        <span class="ActionListItem-visual ActionListItem-action--leading">
          <svg aria-hidden="true" data-component="Octicon" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-check ActionListItem-singleSelectCheckmark">
    <path d="M13.78 4.22a.75.75 0 0 1 0 1.06l-7.25 7.25a.75.75 0 0 1-1.06 0L2.22 9.28a.751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018L6 10.94l6.72-6.72a.75.75 0 0 1 1.06 0Z"></path>
</svg>
        </span>
      <span data-view-component="true" class="ActionListItem-descriptionWrap">
        <span data-view-component="true" class="ActionListItem-label">
           Embed
</span>      <span data-view-component="true" class="ActionListItem-description">Embed this gist in your website.</span>
</span></button>
  
</li>
        <li data-targets="action-list.items" role="none" data-view-component="true" class="ActionListItem">
    
    
    <button value="https://gist.github.com/alandipert/1263783" data-hydro-click="{&quot;event_type&quot;:&quot;clone_or_download.click&quot;,&quot;payload&quot;:{&quot;feature_clicked&quot;:&quot;SHARE&quot;,&quot;git_repository_type&quot;:&quot;GIST&quot;,&quot;gist_id&quot;:1263783,&quot;originating_url&quot;:&quot;https://gist.github.com/alandipert/1263783&quot;,&quot;user_id&quot;:null}}" data-hydro-click-hmac="2aae7c2dcc57b8a8fd1e50d518e5f89b591694929a82038cad97a6f3d48030d4" id="item-c6c9f179-93b3-42db-b7f0-2bf4871b876f" type="button" role="option" aria-selected="false" data-view-component="true" class="ActionListContent">
        <span class="ActionListItem-visual ActionListItem-action--leading">
          <svg aria-hidden="true" data-component="Octicon" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-check ActionListItem-singleSelectCheckmark">
    <path d="M13.78 4.22a.75.75 0 0 1 0 1.06l-7.25 7.25a.75.75 0 0 1-1.06 0L2.22 9.28a.751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018L6 10.94l6.72-6.72a.75.75 0 0 1 1.06 0Z"></path>
</svg>
        </span>
      <span data-view-component="true" class="ActionListItem-descriptionWrap">
        <span data-view-component="true" class="ActionListItem-label">
           Share
</span>      <span data-view-component="true" class="ActionListItem-description">Copy sharable link for this gist.</span>
</span></button>
  
</li>
        <li data-targets="action-list.items" role="none" data-view-component="true" class="ActionListItem">
    
    
    <button value="https://gist.github.com/1263783.git" data-hydro-click="{&quot;event_type&quot;:&quot;clone_or_download.click&quot;,&quot;payload&quot;:{&quot;feature_clicked&quot;:&quot;USE_HTTPS&quot;,&quot;git_repository_type&quot;:&quot;GIST&quot;,&quot;gist_id&quot;:1263783,&quot;originating_url&quot;:&quot;https://gist.github.com/alandipert/1263783&quot;,&quot;user_id&quot;:null}}" data-hydro-click-hmac="19803e5d62e42dbb38127b7017b3d8808c73eb4f3b54171c13cdbcab7209760f" id="item-db02ac51-ff1b-41b3-855c-ad1a4e284fb3" type="button" role="option" aria-selected="false" data-view-component="true" class="ActionListContent">
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    Kahn's topological sort in Clojure
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  <table data-hpc class="highlight tab-size js-file-line-container" data-tab-size="4" data-paste-markdown-skip data-tagsearch-path="kahn.clj">
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          <td id="file-kahn-clj-L1" class="blob-num js-line-number js-blob-rnum" data-line-number="1"></td>
          <td id="file-kahn-clj-LC1" class="blob-code blob-code-inner js-file-line">;; Copyright (c) Alan Dipert. All rights reserved.</td>
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          <td id="file-kahn-clj-L2" class="blob-num js-line-number js-blob-rnum" data-line-number="2"></td>
          <td id="file-kahn-clj-LC2" class="blob-code blob-code-inner js-file-line">;; The use and distribution terms for this software are covered by the</td>
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          <td id="file-kahn-clj-L3" class="blob-num js-line-number js-blob-rnum" data-line-number="3"></td>
          <td id="file-kahn-clj-LC3" class="blob-code blob-code-inner js-file-line">;; Eclipse Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php)</td>
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          <td id="file-kahn-clj-L4" class="blob-num js-line-number js-blob-rnum" data-line-number="4"></td>
          <td id="file-kahn-clj-LC4" class="blob-code blob-code-inner js-file-line">;; By using this software in any fashion, you are agreeing to be bound by</td>
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          <td id="file-kahn-clj-L5" class="blob-num js-line-number js-blob-rnum" data-line-number="5"></td>
          <td id="file-kahn-clj-LC5" class="blob-code blob-code-inner js-file-line">;; the terms of this license.</td>
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          <td id="file-kahn-clj-L6" class="blob-num js-line-number js-blob-rnum" data-line-number="6"></td>
          <td id="file-kahn-clj-LC6" class="blob-code blob-code-inner js-file-line">;; You must not remove this notice, or any other, from this software.</td>
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          <td id="file-kahn-clj-L7" class="blob-num js-line-number js-blob-rnum" data-line-number="7"></td>
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          <td id="file-kahn-clj-L8" class="blob-num js-line-number js-blob-rnum" data-line-number="8"></td>
          <td id="file-kahn-clj-LC8" class="blob-code blob-code-inner js-file-line">(ns alandipert.kahn</td>
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        <tr>
          <td id="file-kahn-clj-L9" class="blob-num js-line-number js-blob-rnum" data-line-number="9"></td>
          <td id="file-kahn-clj-LC9" class="blob-code blob-code-inner js-file-line">  (:require [clojure.set :refer [difference union intersection]]))</td>
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        <tr>
          <td id="file-kahn-clj-L10" class="blob-num js-line-number js-blob-rnum" data-line-number="10"></td>
          <td id="file-kahn-clj-LC10" class="blob-code blob-code-inner js-file-line">
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        <tr>
          <td id="file-kahn-clj-L11" class="blob-num js-line-number js-blob-rnum" data-line-number="11"></td>
          <td id="file-kahn-clj-LC11" class="blob-code blob-code-inner js-file-line">(defn without</td>
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        <tr>
          <td id="file-kahn-clj-L12" class="blob-num js-line-number js-blob-rnum" data-line-number="12"></td>
          <td id="file-kahn-clj-LC12" class="blob-code blob-code-inner js-file-line">  &quot;Returns set s with x removed.&quot;</td>
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        <tr>
          <td id="file-kahn-clj-L13" class="blob-num js-line-number js-blob-rnum" data-line-number="13"></td>
          <td id="file-kahn-clj-LC13" class="blob-code blob-code-inner js-file-line">  [s x] (difference s #{x}))</td>
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          <td id="file-kahn-clj-L14" class="blob-num js-line-number js-blob-rnum" data-line-number="14"></td>
          <td id="file-kahn-clj-LC14" class="blob-code blob-code-inner js-file-line">
</td>
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        <tr>
          <td id="file-kahn-clj-L15" class="blob-num js-line-number js-blob-rnum" data-line-number="15"></td>
          <td id="file-kahn-clj-LC15" class="blob-code blob-code-inner js-file-line">(defn take-1</td>
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          <td id="file-kahn-clj-L16" class="blob-num js-line-number js-blob-rnum" data-line-number="16"></td>
          <td id="file-kahn-clj-LC16" class="blob-code blob-code-inner js-file-line">  &quot;Returns the pair [element, s&#39;] where s&#39; is set s with element removed.&quot;</td>
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        <tr>
          <td id="file-kahn-clj-L17" class="blob-num js-line-number js-blob-rnum" data-line-number="17"></td>
          <td id="file-kahn-clj-LC17" class="blob-code blob-code-inner js-file-line">  [s] {:pre [(not (empty? s))]}</td>
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        <tr>
          <td id="file-kahn-clj-L18" class="blob-num js-line-number js-blob-rnum" data-line-number="18"></td>
          <td id="file-kahn-clj-LC18" class="blob-code blob-code-inner js-file-line">  (let [item (first s)]</td>
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          <td id="file-kahn-clj-L19" class="blob-num js-line-number js-blob-rnum" data-line-number="19"></td>
          <td id="file-kahn-clj-LC19" class="blob-code blob-code-inner js-file-line">    [item (without s item)]))</td>
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          <td id="file-kahn-clj-L20" class="blob-num js-line-number js-blob-rnum" data-line-number="20"></td>
          <td id="file-kahn-clj-LC20" class="blob-code blob-code-inner js-file-line">
</td>
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          <td id="file-kahn-clj-L21" class="blob-num js-line-number js-blob-rnum" data-line-number="21"></td>
          <td id="file-kahn-clj-LC21" class="blob-code blob-code-inner js-file-line">(defn no-incoming</td>
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          <td id="file-kahn-clj-L22" class="blob-num js-line-number js-blob-rnum" data-line-number="22"></td>
          <td id="file-kahn-clj-LC22" class="blob-code blob-code-inner js-file-line">  &quot;Returns the set of nodes in graph g for which there are no incoming</td>
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          <td id="file-kahn-clj-L23" class="blob-num js-line-number js-blob-rnum" data-line-number="23"></td>
          <td id="file-kahn-clj-LC23" class="blob-code blob-code-inner js-file-line">  edges, where g is a map of nodes to sets of nodes.&quot;</td>
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          <td id="file-kahn-clj-L24" class="blob-num js-line-number js-blob-rnum" data-line-number="24"></td>
          <td id="file-kahn-clj-LC24" class="blob-code blob-code-inner js-file-line">  [g]</td>
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          <td id="file-kahn-clj-L25" class="blob-num js-line-number js-blob-rnum" data-line-number="25"></td>
          <td id="file-kahn-clj-LC25" class="blob-code blob-code-inner js-file-line">  (let [nodes (set (keys g))</td>
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          <td id="file-kahn-clj-LC26" class="blob-code blob-code-inner js-file-line">        have-incoming (apply union (vals g))]</td>
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          <td id="file-kahn-clj-L27" class="blob-num js-line-number js-blob-rnum" data-line-number="27"></td>
          <td id="file-kahn-clj-LC27" class="blob-code blob-code-inner js-file-line">    (difference nodes have-incoming)))</td>
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          <td id="file-kahn-clj-L28" class="blob-num js-line-number js-blob-rnum" data-line-number="28"></td>
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</td>
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          <td id="file-kahn-clj-L29" class="blob-num js-line-number js-blob-rnum" data-line-number="29"></td>
          <td id="file-kahn-clj-LC29" class="blob-code blob-code-inner js-file-line">(defn normalize</td>
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          <td id="file-kahn-clj-L30" class="blob-num js-line-number js-blob-rnum" data-line-number="30"></td>
          <td id="file-kahn-clj-LC30" class="blob-code blob-code-inner js-file-line">  &quot;Returns g with empty outgoing edges added for nodes with incoming</td>
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          <td id="file-kahn-clj-L31" class="blob-num js-line-number js-blob-rnum" data-line-number="31"></td>
          <td id="file-kahn-clj-LC31" class="blob-code blob-code-inner js-file-line">  edges only.  Example: {:a #{:b}} =&gt; {:a #{:b}, :b #{}}&quot;</td>
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          <td id="file-kahn-clj-L32" class="blob-num js-line-number js-blob-rnum" data-line-number="32"></td>
          <td id="file-kahn-clj-LC32" class="blob-code blob-code-inner js-file-line">  [g]</td>
        </tr>
        <tr>
          <td id="file-kahn-clj-L33" class="blob-num js-line-number js-blob-rnum" data-line-number="33"></td>
          <td id="file-kahn-clj-LC33" class="blob-code blob-code-inner js-file-line">  (let [have-incoming (apply union (vals g))]</td>
        </tr>
        <tr>
          <td id="file-kahn-clj-L34" class="blob-num js-line-number js-blob-rnum" data-line-number="34"></td>
          <td id="file-kahn-clj-LC34" class="blob-code blob-code-inner js-file-line">    (reduce #(if (get % %2) % (assoc % %2 #{})) g have-incoming)))</td>
        </tr>
        <tr>
          <td id="file-kahn-clj-L35" class="blob-num js-line-number js-blob-rnum" data-line-number="35"></td>
          <td id="file-kahn-clj-LC35" class="blob-code blob-code-inner js-file-line">
</td>
        </tr>
        <tr>
          <td id="file-kahn-clj-L36" class="blob-num js-line-number js-blob-rnum" data-line-number="36"></td>
          <td id="file-kahn-clj-LC36" class="blob-code blob-code-inner js-file-line">(defn kahn-sort</td>
        </tr>
        <tr>
          <td id="file-kahn-clj-L37" class="blob-num js-line-number js-blob-rnum" data-line-number="37"></td>
          <td id="file-kahn-clj-LC37" class="blob-code blob-code-inner js-file-line">  &quot;Proposes a topological sort for directed graph g using Kahn&#39;s</td>
        </tr>
        <tr>
          <td id="file-kahn-clj-L38" class="blob-num js-line-number js-blob-rnum" data-line-number="38"></td>
          <td id="file-kahn-clj-LC38" class="blob-code blob-code-inner js-file-line">   algorithm, where g is a map of nodes to sets of nodes. If g is</td>
        </tr>
        <tr>
          <td id="file-kahn-clj-L39" class="blob-num js-line-number js-blob-rnum" data-line-number="39"></td>
          <td id="file-kahn-clj-LC39" class="blob-code blob-code-inner js-file-line">   cyclic, returns nil.&quot;</td>
        </tr>
        <tr>
          <td id="file-kahn-clj-L40" class="blob-num js-line-number js-blob-rnum" data-line-number="40"></td>
          <td id="file-kahn-clj-LC40" class="blob-code blob-code-inner js-file-line">  ([g]</td>
        </tr>
        <tr>
          <td id="file-kahn-clj-L41" class="blob-num js-line-number js-blob-rnum" data-line-number="41"></td>
          <td id="file-kahn-clj-LC41" class="blob-code blob-code-inner js-file-line">     (kahn-sort (normalize g) [] (no-incoming g)))</td>
        </tr>
        <tr>
          <td id="file-kahn-clj-L42" class="blob-num js-line-number js-blob-rnum" data-line-number="42"></td>
          <td id="file-kahn-clj-LC42" class="blob-code blob-code-inner js-file-line">  ([g l s]</td>
        </tr>
        <tr>
          <td id="file-kahn-clj-L43" class="blob-num js-line-number js-blob-rnum" data-line-number="43"></td>
          <td id="file-kahn-clj-LC43" class="blob-code blob-code-inner js-file-line">     (if (empty? s)</td>
        </tr>
        <tr>
          <td id="file-kahn-clj-L44" class="blob-num js-line-number js-blob-rnum" data-line-number="44"></td>
          <td id="file-kahn-clj-LC44" class="blob-code blob-code-inner js-file-line">       (when (every? empty? (vals g)) l)</td>
        </tr>
        <tr>
          <td id="file-kahn-clj-L45" class="blob-num js-line-number js-blob-rnum" data-line-number="45"></td>
          <td id="file-kahn-clj-LC45" class="blob-code blob-code-inner js-file-line">       (let [[n s&#39;] (take-1 s)</td>
        </tr>
        <tr>
          <td id="file-kahn-clj-L46" class="blob-num js-line-number js-blob-rnum" data-line-number="46"></td>
          <td id="file-kahn-clj-LC46" class="blob-code blob-code-inner js-file-line">             m (g n)</td>
        </tr>
        <tr>
          <td id="file-kahn-clj-L47" class="blob-num js-line-number js-blob-rnum" data-line-number="47"></td>
          <td id="file-kahn-clj-LC47" class="blob-code blob-code-inner js-file-line">             g&#39; (reduce #(update-in % [n] without %2) g m)]</td>
        </tr>
        <tr>
          <td id="file-kahn-clj-L48" class="blob-num js-line-number js-blob-rnum" data-line-number="48"></td>
          <td id="file-kahn-clj-LC48" class="blob-code blob-code-inner js-file-line">         (recur g&#39; (conj l n) (union s&#39; (intersection (no-incoming g&#39;) m)))))))</td>
        </tr>
        <tr>
          <td id="file-kahn-clj-L49" class="blob-num js-line-number js-blob-rnum" data-line-number="49"></td>
          <td id="file-kahn-clj-LC49" class="blob-code blob-code-inner js-file-line">
</td>
        </tr>
        <tr>
          <td id="file-kahn-clj-L50" class="blob-num js-line-number js-blob-rnum" data-line-number="50"></td>
          <td id="file-kahn-clj-LC50" class="blob-code blob-code-inner js-file-line">(comment</td>
        </tr>
        <tr>
          <td id="file-kahn-clj-L51" class="blob-num js-line-number js-blob-rnum" data-line-number="51"></td>
          <td id="file-kahn-clj-LC51" class="blob-code blob-code-inner js-file-line">  (def acyclic-g</td>
        </tr>
        <tr>
          <td id="file-kahn-clj-L52" class="blob-num js-line-number js-blob-rnum" data-line-number="52"></td>
          <td id="file-kahn-clj-LC52" class="blob-code blob-code-inner js-file-line">    {7 #{11 8}</td>
        </tr>
        <tr>
          <td id="file-kahn-clj-L53" class="blob-num js-line-number js-blob-rnum" data-line-number="53"></td>
          <td id="file-kahn-clj-LC53" class="blob-code blob-code-inner js-file-line">     5 #{11}</td>
        </tr>
        <tr>
          <td id="file-kahn-clj-L54" class="blob-num js-line-number js-blob-rnum" data-line-number="54"></td>
          <td id="file-kahn-clj-LC54" class="blob-code blob-code-inner js-file-line">     3 #{8 10}</td>
        </tr>
        <tr>
          <td id="file-kahn-clj-L55" class="blob-num js-line-number js-blob-rnum" data-line-number="55"></td>
          <td id="file-kahn-clj-LC55" class="blob-code blob-code-inner js-file-line">     11 #{2 9}</td>
        </tr>
        <tr>
          <td id="file-kahn-clj-L56" class="blob-num js-line-number js-blob-rnum" data-line-number="56"></td>
          <td id="file-kahn-clj-LC56" class="blob-code blob-code-inner js-file-line">     8 #{9}})</td>
        </tr>
        <tr>
          <td id="file-kahn-clj-L57" class="blob-num js-line-number js-blob-rnum" data-line-number="57"></td>
          <td id="file-kahn-clj-LC57" class="blob-code blob-code-inner js-file-line">
</td>
        </tr>
        <tr>
          <td id="file-kahn-clj-L58" class="blob-num js-line-number js-blob-rnum" data-line-number="58"></td>
          <td id="file-kahn-clj-LC58" class="blob-code blob-code-inner js-file-line">  (def cyclic-g</td>
        </tr>
        <tr>
          <td id="file-kahn-clj-L59" class="blob-num js-line-number js-blob-rnum" data-line-number="59"></td>
          <td id="file-kahn-clj-LC59" class="blob-code blob-code-inner js-file-line">    {7 #{11 8}</td>
        </tr>
        <tr>
          <td id="file-kahn-clj-L60" class="blob-num js-line-number js-blob-rnum" data-line-number="60"></td>
          <td id="file-kahn-clj-LC60" class="blob-code blob-code-inner js-file-line">     5 #{11}</td>
        </tr>
        <tr>
          <td id="file-kahn-clj-L61" class="blob-num js-line-number js-blob-rnum" data-line-number="61"></td>
          <td id="file-kahn-clj-LC61" class="blob-code blob-code-inner js-file-line">     3 #{8 10}</td>
        </tr>
        <tr>
          <td id="file-kahn-clj-L62" class="blob-num js-line-number js-blob-rnum" data-line-number="62"></td>
          <td id="file-kahn-clj-LC62" class="blob-code blob-code-inner js-file-line">     11 #{2 9}</td>
        </tr>
        <tr>
          <td id="file-kahn-clj-L63" class="blob-num js-line-number js-blob-rnum" data-line-number="63"></td>
          <td id="file-kahn-clj-LC63" class="blob-code blob-code-inner js-file-line">     8 #{9}</td>
        </tr>
        <tr>
          <td id="file-kahn-clj-L64" class="blob-num js-line-number js-blob-rnum" data-line-number="64"></td>
          <td id="file-kahn-clj-LC64" class="blob-code blob-code-inner js-file-line">     2 #{11}}) ;oops, a cycle!</td>
        </tr>
        <tr>
          <td id="file-kahn-clj-L65" class="blob-num js-line-number js-blob-rnum" data-line-number="65"></td>
          <td id="file-kahn-clj-LC65" class="blob-code blob-code-inner js-file-line">
</td>
        </tr>
        <tr>
          <td id="file-kahn-clj-L66" class="blob-num js-line-number js-blob-rnum" data-line-number="66"></td>
          <td id="file-kahn-clj-LC66" class="blob-code blob-code-inner js-file-line">  (kahn-sort acyclic-g) ;=&gt; [3 5 7 8 10 11 2 9]</td>
        </tr>
        <tr>
          <td id="file-kahn-clj-L67" class="blob-num js-line-number js-blob-rnum" data-line-number="67"></td>
          <td id="file-kahn-clj-LC67" class="blob-code blob-code-inner js-file-line">  (kahn-sort cyclic-g) ;=&gt; nil</td>
        </tr>
        <tr>
          <td id="file-kahn-clj-L68" class="blob-num js-line-number js-blob-rnum" data-line-number="68"></td>
          <td id="file-kahn-clj-LC68" class="blob-code blob-code-inner js-file-line">
</td>
        </tr>
        <tr>
          <td id="file-kahn-clj-L69" class="blob-num js-line-number js-blob-rnum" data-line-number="69"></td>
          <td id="file-kahn-clj-LC69" class="blob-code blob-code-inner js-file-line">  )</td>
        </tr>
  </table>
</div>


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      commented 


        <a href="/alandipert/1263783?permalink_comment_id=808115#gistcomment-808115" id="gistcomment-808115-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2013-03-30T20:00:44Z" class="no-wrap">Mar 30, 2013</relative-time></a>



      
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Thanks
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      <p dir="auto">Could you please add a license?</p>
<p dir="auto">Thanks</p>
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      commented 


        <a href="/alandipert/1263783?permalink_comment_id=828713#gistcomment-828713" id="gistcomment-828713-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2013-05-10T18:28:26Z" class="no-wrap">May 10, 2013</relative-time></a>



      
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Also you can remove items from a set without performing a difference:

``` clojure
(disj s x)
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      <p dir="auto">+1 for a license.<br>
Also you can remove items from a set without performing a difference:</p>
<div class="highlight highlight-source-clojure" dir="auto"><pre class="notranslate">(<span class="pl-en">disj</span> s x)</pre></div>
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      commented 


        <a href="/alandipert/1263783?permalink_comment_id=881472#gistcomment-881472" id="gistcomment-881472-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2013-08-06T18:41:13Z" class="no-wrap">Aug 6, 2013</relative-time></a>



      
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        <a href="/alandipert/1263783?permalink_comment_id=1234522#gistcomment-1234522" id="gistcomment-1234522-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2014-05-24T00:14:42Z" class="no-wrap">May 24, 2014</relative-time></a>



      
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      <p dir="auto">Awesome, thanks. Needed this and I was able to use it without a single modification to my original code. Now, try that on Java!</p>
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        <a href="/alandipert/1263783?permalink_comment_id=1804270#gistcomment-1804270" id="gistcomment-1804270-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2016-06-17T23:59:14Z" class="no-wrap">Jun 17, 2016</relative-time></a>



      
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      <p dir="auto">Also used to good effect! I'm not sure what you mean by working on non-set values by using difference, though, <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/alandipert/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/alandipert">@alandipert</a>, as "difference" only works on sets as much as "disj" does.</p>
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        <a href="/alandipert/1263783?permalink_comment_id=4212901#gistcomment-4212901" id="gistcomment-4212901-permalink" class="Link--secondary js-timestamp"><relative-time datetime="2022-06-26T14:31:26Z" class="no-wrap">Jun 26, 2022</relative-time></a>



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  <clipboard-copy role="menuitem" value="Hi, why is there the `{:pre [(not (empty? s))]}` form in `take-1` function? It seems to me it is not useful at all but I am Clojure beginner. Thank you, @alandipert. 

EDIT: it throws an error when hash-set is empty – is that the reason?" data-view-component="true" class="dropdown-item btn-link">
      
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      <p dir="auto">Hi, why is there the <code class="notranslate">{:pre [(not (empty? s))]}</code> form in <code class="notranslate">take-1</code> function? It seems to me it is not useful at all but I am Clojure beginner. Thank you, <a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/users/alandipert/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/alandipert">@alandipert</a>.</p>
<p dir="auto">EDIT: it throws an error when hash-set is empty – is that the reason?</p>
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    <template id="snippet-clipboard-copy-button">
  <div class="zeroclipboard-container position-absolute right-0 top-0">
    <clipboard-copy aria-label="Copy code to clipboard" class="ClipboardButton btn js-clipboard-copy m-2 p-0" data-copy-feedback="Copied!" data-tooltip-direction="w">
      <svg aria-hidden="true" data-component="Octicon" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-copy js-clipboard-copy-icon m-2 tmp-m-2">
    <path d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 0 1 0 1.5h-1.5a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-1.5a.75.75 0 0 1 1.5 0v1.5A1.75 1.75 0 0 1 9.25 16h-7.5A1.75 1.75 0 0 1 0 14.25Z"></path><path d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0 1 14.25 11h-7.5A1.75 1.75 0 0 1 5 9.25Zm1.75-.25a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-7.5a.25.25 0 0 0-.25-.25Z"></path>
</svg>
      <svg aria-hidden="true" data-component="Octicon" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-check js-clipboard-check-icon color-fg-success d-none m-2 tmp-m-2">
    <path d="M13.78 4.22a.75.75 0 0 1 0 1.06l-7.25 7.25a.75.75 0 0 1-1.06 0L2.22 9.28a.751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018L6 10.94l6.72-6.72a.75.75 0 0 1 1.06 0Z"></path>
</svg>
    </clipboard-copy>
  </div>
</template>
<template id="snippet-clipboard-copy-button-unpositioned">
  <div class="zeroclipboard-container">
    <clipboard-copy aria-label="Copy code to clipboard" class="ClipboardButton btn btn-invisible js-clipboard-copy m-2 p-0 d-flex flex-justify-center flex-items-center" data-copy-feedback="Copied!" data-tooltip-direction="w">
      <svg aria-hidden="true" data-component="Octicon" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-copy js-clipboard-copy-icon">
    <path d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 0 1 0 1.5h-1.5a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-1.5a.75.75 0 0 1 1.5 0v1.5A1.75 1.75 0 0 1 9.25 16h-7.5A1.75 1.75 0 0 1 0 14.25Z"></path><path d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0 1 14.25 11h-7.5A1.75 1.75 0 0 1 5 9.25Zm1.75-.25a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-7.5a.25.25 0 0 0-.25-.25Z"></path>
</svg>
      <svg aria-hidden="true" data-component="Octicon" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-check js-clipboard-check-icon color-fg-success d-none">
    <path d="M13.78 4.22a.75.75 0 0 1 0 1.06l-7.25 7.25a.75.75 0 0 1-1.06 0L2.22 9.28a.751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018L6 10.94l6.72-6.72a.75.75 0 0 1 1.06 0Z"></path>
</svg>
    </clipboard-copy>
  </div>
</template>




    </div>
    <div id="js-global-screen-reader-notice" class="sr-only mt-n1" aria-live="polite" aria-atomic="true" ></div>
    <div id="js-global-screen-reader-notice-assertive" class="sr-only mt-n1" aria-live="assertive" aria-atomic="true"></div>
  </body>
</html>