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<li class="navelem"><a class="el" href="namespaceoperations__research.html">operations_research</a></li><li class="navelem"><a class="el" href="classoperations__research_1_1SparsePermutation.html">SparsePermutation</a></li> </ul>
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<p>A compact representation for permutations of {0..N-1} that displaces few elements: it needs only O(K) memory for a permutation that displaces K elements.
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<a href="classoperations__research_1_1SparsePermutation.html#details">More...</a></p>
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<p><code>#include <<a class="el" href="sparse__permutation_8h_source.html">sparse_permutation.h</a>></code></p>
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Classes</h2></td></tr>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">struct  </td><td class="memItemRight" valign="bottom"><a class="el" href="structoperations__research_1_1SparsePermutation_1_1Iterator.html">Iterator</a></td></tr>
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Public Member Functions</h2></td></tr>
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<tr class="memitem:ab4ee5c7df12fcaeb042a8c52654569bd"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classoperations__research_1_1SparsePermutation.html#ab4ee5c7df12fcaeb042a8c52654569bd">SparsePermutation</a> (int size)</td></tr>
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<tr class="memitem:aff385d18c768ffa364c5dccb5fb35c0a"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classoperations__research_1_1SparsePermutation.html#aff385d18c768ffa364c5dccb5fb35c0a">Size</a> () const</td></tr>
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<tr class="memitem:a4941ad4a0095fa3bc4e8aa0e8fb521bf"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classoperations__research_1_1SparsePermutation.html#a4941ad4a0095fa3bc4e8aa0e8fb521bf">NumCycles</a> () const</td></tr>
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<tr class="memitem:a0b05b1e840388f9aba5bbe79a392d7d6"><td class="memItemLeft" align="right" valign="top">const std::vector< int > & </td><td class="memItemRight" valign="bottom"><a class="el" href="classoperations__research_1_1SparsePermutation.html#a0b05b1e840388f9aba5bbe79a392d7d6">Support</a> () const</td></tr>
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<tr class="memdesc:a0b05b1e840388f9aba5bbe79a392d7d6"><td class="mdescLeft"> </td><td class="mdescRight">Returns the "support" of this permutation; that is, the set of elements displaced by it. <a href="#a0b05b1e840388f9aba5bbe79a392d7d6">More...</a><br /></td></tr>
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<tr class="memitem:a59a2f011b1fdc9a63d6557749542c354"><td class="memItemLeft" align="right" valign="top"><a class="el" href="structoperations__research_1_1SparsePermutation_1_1Iterator.html">Iterator</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classoperations__research_1_1SparsePermutation.html#a59a2f011b1fdc9a63d6557749542c354">Cycle</a> (int i) const</td></tr>
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<tr class="memitem:a9fc0ca5752b5ad6cc2a78ff7c512b22a"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="classoperations__research_1_1SparsePermutation.html#a9fc0ca5752b5ad6cc2a78ff7c512b22a">LastElementInCycle</a> (int i) const</td></tr>
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<tr class="memdesc:a9fc0ca5752b5ad6cc2a78ff7c512b22a"><td class="mdescLeft"> </td><td class="mdescRight">This is useful for iterating over the pair {element, image} of a permutation: <a href="#a9fc0ca5752b5ad6cc2a78ff7c512b22a">More...</a><br /></td></tr>
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<tr class="memitem:ac1e64e1e738964d338be3cac2b2a58fd"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classoperations__research_1_1SparsePermutation.html#ac1e64e1e738964d338be3cac2b2a58fd">AddToCurrentCycle</a> (int x)</td></tr>
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<tr class="memdesc:ac1e64e1e738964d338be3cac2b2a58fd"><td class="mdescLeft"> </td><td class="mdescRight">To add a cycle to the permutation, repeatedly call <a class="el" href="classoperations__research_1_1SparsePermutation.html#ac1e64e1e738964d338be3cac2b2a58fd" title="To add a cycle to the permutation, repeatedly call AddToCurrentCycle() with the cycle's orbit,...">AddToCurrentCycle()</a> with the cycle's orbit, then call <a class="el" href="classoperations__research_1_1SparsePermutation.html#ac1e42a48198d2abc8642d81f6b846fee">CloseCurrentCycle()</a>; This shouldn't be called on trivial cycles (of length 1). <a href="#ac1e64e1e738964d338be3cac2b2a58fd">More...</a><br /></td></tr>
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<tr class="memitem:ac1e42a48198d2abc8642d81f6b846fee"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classoperations__research_1_1SparsePermutation.html#ac1e42a48198d2abc8642d81f6b846fee">CloseCurrentCycle</a> ()</td></tr>
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<tr class="memitem:abca48ca404a02f35f06f295814407100"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="classoperations__research_1_1SparsePermutation.html#abca48ca404a02f35f06f295814407100">RemoveCycles</a> (const std::vector< int > &cycle_indices)</td></tr>
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<tr class="memdesc:abca48ca404a02f35f06f295814407100"><td class="mdescLeft"> </td><td class="mdescRight">Removes the cycles with given indices from the permutation. <a href="#abca48ca404a02f35f06f295814407100">More...</a><br /></td></tr>
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<tr class="memitem:a6886dcada3acf697af20e88ce32a7ae1"><td class="memItemLeft" align="right" valign="top">std::string </td><td class="memItemRight" valign="bottom"><a class="el" href="classoperations__research_1_1SparsePermutation.html#a6886dcada3acf697af20e88ce32a7ae1">DebugString</a> () const</td></tr>
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<tr class="memdesc:a6886dcada3acf697af20e88ce32a7ae1"><td class="mdescLeft"> </td><td class="mdescRight">Output all non-identity cycles of the permutation, sorted lexicographically (each cycle is described starting by its smallest element; and all cycles are sorted lexicographically against each other). <a href="#a6886dcada3acf697af20e88ce32a7ae1">More...</a><br /></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
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<div class="textblock"><p>A compact representation for permutations of {0..N-1} that displaces few elements: it needs only O(K) memory for a permutation that displaces K elements. </p>
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<p class="definition">Definition at line <a class="el" href="sparse__permutation_8h_source.html#l00027">27</a> of file <a class="el" href="sparse__permutation_8h_source.html">sparse_permutation.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#ab4ee5c7df12fcaeb042a8c52654569bd">◆ </a></span>SparsePermutation()</h2>
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<p class="definition">Definition at line <a class="el" href="sparse__permutation_8h_source.html#l00029">29</a> of file <a class="el" href="sparse__permutation_8h_source.html">sparse_permutation.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#ac1e64e1e738964d338be3cac2b2a58fd">◆ </a></span>AddToCurrentCycle()</h2>
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<td class="memname">void operations_research::SparsePermutation::AddToCurrentCycle </td>
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<p>To add a cycle to the permutation, repeatedly call <a class="el" href="classoperations__research_1_1SparsePermutation.html#ac1e64e1e738964d338be3cac2b2a58fd" title="To add a cycle to the permutation, repeatedly call AddToCurrentCycle() with the cycle's orbit,...">AddToCurrentCycle()</a> with the cycle's orbit, then call <a class="el" href="classoperations__research_1_1SparsePermutation.html#ac1e42a48198d2abc8642d81f6b846fee">CloseCurrentCycle()</a>; This shouldn't be called on trivial cycles (of length 1). </p>
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<p class="definition">Definition at line <a class="el" href="sparse__permutation_8h_source.html#l00084">84</a> of file <a class="el" href="sparse__permutation_8h_source.html">sparse_permutation.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#ac1e42a48198d2abc8642d81f6b846fee">◆ </a></span>CloseCurrentCycle()</h2>
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<p class="definition">Definition at line <a class="el" href="sparse__permutation_8h_source.html#l00090">90</a> of file <a class="el" href="sparse__permutation_8h_source.html">sparse_permutation.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a59a2f011b1fdc9a63d6557749542c354">◆ </a></span>Cycle()</h2>
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<td class="memname"><a class="el" href="structoperations__research_1_1SparsePermutation_1_1Iterator.html">SparsePermutation::Iterator</a> operations_research::SparsePermutation::Cycle </td>
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<p class="definition">Definition at line <a class="el" href="sparse__permutation_8h_source.html#l00117">117</a> of file <a class="el" href="sparse__permutation_8h_source.html">sparse_permutation.h</a>.</p>
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<p>Output all non-identity cycles of the permutation, sorted lexicographically (each cycle is described starting by its smallest element; and all cycles are sorted lexicographically against each other). </p>
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<p>This isn't efficient; use for debugging only. Example: "(1 4 3) (5 9) (6 8 7)". </p>
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<p>This is useful for iterating over the pair {element, image} of a permutation: </p>
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<p>for (int c = 0; c < perm.NumCycles(); ++c) { int element = LastElementInCycle(c); for (int image : perm.Cycle(c)) { ///< The pair is (element, image). ... element = image; } }</p>
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<dl class="todo"><dt><b><a class="el" href="todo.html#_todo000013">Todo:</a></b></dt><dd>(user): Provide a full iterator for this? Note that we have more information with the loop above. Not sure it is needed though. </dd></dl>
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<p class="definition">Definition at line <a class="el" href="sparse__permutation_8h_source.html#l00124">124</a> of file <a class="el" href="sparse__permutation_8h_source.html">sparse_permutation.h</a>.</p>
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<p class="definition">Definition at line <a class="el" href="sparse__permutation_8h_source.html#l00033">33</a> of file <a class="el" href="sparse__permutation_8h_source.html">sparse_permutation.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#abca48ca404a02f35f06f295814407100">◆ </a></span>RemoveCycles()</h2>
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<td class="memname">void operations_research::SparsePermutation::RemoveCycles </td>
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<p>Removes the cycles with given indices from the permutation. </p>
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<p>This works in O(K) for a permutation displacing K elements. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#aff385d18c768ffa364c5dccb5fb35c0a">◆ </a></span>Size()</h2>
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<dl class="todo"><dt><b><a class="el" href="todo.html#_todo000012">Todo:</a></b></dt><dd>(user,user): complete the reader API. </dd></dl>
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<p class="definition">Definition at line <a class="el" href="sparse__permutation_8h_source.html#l00032">32</a> of file <a class="el" href="sparse__permutation_8h_source.html">sparse_permutation.h</a>.</p>
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<h2 class="memtitle"><span class="permalink"><a href="#a0b05b1e840388f9aba5bbe79a392d7d6">◆ </a></span>Support()</h2>
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<td class="memname">const std::vector<int>& operations_research::SparsePermutation::Support </td>
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<p>Returns the "support" of this permutation; that is, the set of elements displaced by it. </p>
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<p class="definition">Definition at line <a class="el" href="sparse__permutation_8h_source.html#l00037">37</a> of file <a class="el" href="sparse__permutation_8h_source.html">sparse_permutation.h</a>.</p>
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<hr/>The documentation for this class was generated from the following file:<ul>
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<li><a class="el" href="sparse__permutation_8h_source.html">sparse_permutation.h</a></li>
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