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< a href = "sparse__permutation_8cc.html" > Go to the documentation of this file.< / a > < div class = "fragment" > < div class = "line" > < a name = "l00001" > < / a > < span class = "lineno" > 1< / span >   < span class = "comment" > // Copyright 2010-2018 Google LLC< / span > < / div >
< div class = "line" > < a name = "l00002" > < / a > < span class = "lineno" > 2< / span >   < span class = "comment" > // Licensed under the Apache License, Version 2.0 (the " License" );< / span > < / div >
< div class = "line" > < a name = "l00003" > < / a > < span class = "lineno" > 3< / span >   < span class = "comment" > // you may not use this file except in compliance with the License.< / span > < / div >
< div class = "line" > < a name = "l00004" > < / a > < span class = "lineno" > 4< / span >   < span class = "comment" > // You may obtain a copy of the License at< / span > < / div >
< div class = "line" > < a name = "l00005" > < / a > < span class = "lineno" > 5< / span >   < span class = "comment" > //< / span > < / div >
< div class = "line" > < a name = "l00006" > < / a > < span class = "lineno" > 6< / span >   < span class = "comment" > // http://www.apache.org/licenses/LICENSE-2.0< / span > < / div >
< div class = "line" > < a name = "l00007" > < / a > < span class = "lineno" > 7< / span >   < span class = "comment" > //< / span > < / div >
< div class = "line" > < a name = "l00008" > < / a > < span class = "lineno" > 8< / span >   < span class = "comment" > // Unless required by applicable law or agreed to in writing, software< / span > < / div >
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< div class = "line" > < a name = "l00011" > < / a > < span class = "lineno" > 11< / span >   < span class = "comment" > // See the License for the specific language governing permissions and< / span > < / div >
< div class = "line" > < a name = "l00012" > < / a > < span class = "lineno" > 12< / span >   < span class = "comment" > // limitations under the License.< / span > < / div >
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< div class = "line" > < a name = "l00014" > < / a > < span class = "lineno" > 14< / span >   < span class = "preprocessor" > #include " < a class = "code" href = "sparse__permutation_8h.html" > ortools/algorithms/sparse_permutation.h< / a > " < / span > < / div >
< div class = "line" > < a name = "l00015" > < / a > < span class = "lineno" > 15< / span >   < / div >
< div class = "line" > < a name = "l00016" > < / a > < span class = "lineno" > 16< / span >   < span class = "preprocessor" > #include < algorithm> < / span > < / div >
< div class = "line" > < a name = "l00017" > < / a > < span class = "lineno" > 17< / span >   < / div >
< div class = "line" > < a name = "l00018" > < / a > < span class = "lineno" > 18< / span >   < span class = "preprocessor" > #include " absl/strings/str_join.h" < / span > < / div >
< div class = "line" > < a name = "l00019" > < / a > < span class = "lineno" > 19< / span >   < span class = "preprocessor" > #include " < a class = "code" href = "base_2logging_8h.html" > ortools/base/logging.h< / a > " < / span > < / div >
< div class = "line" > < a name = "l00020" > < / a > < span class = "lineno" > 20< / span >   < / div >
< div class = "line" > < a name = "l00021" > < / a > < span class = "lineno" > 21< / span >   < span class = "keyword" > namespace < / span > < a class = "code" href = "namespaceoperations__research.html" > operations_research< / a > {< / div >
< div class = "line" > < a name = "l00022" > < / a > < span class = "lineno" > 22< / span >   < / div >
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< div class = "line" > < a name = "l00023" > < / a > < span class = "lineno" > < a class = "line" href = "classoperations__research_1_1_sparse_permutation.html#a9add43490c45e4334099bb15b6e6eab0" > 23< / a > < / span >   < span class = "keywordtype" > void< / span > < a class = "code" href = "classoperations__research_1_1_sparse_permutation.html#a9add43490c45e4334099bb15b6e6eab0" > SparsePermutation::RemoveCycles< / a > (< span class = "keyword" > const< / span > std::vector< int> & cycle_indices) {< / div >
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< div class = "line" > < a name = "l00024" > < / a > < span class = "lineno" > 24< / span >   < span class = "comment" > // TODO(user): make this a class member to avoid allocation if the complexity< / span > < / div >
< div class = "line" > < a name = "l00025" > < / a > < span class = "lineno" > 25< / span >   < span class = "comment" > // becomes an issue. In this case, also optimize the loop below by not copying< / span > < / div >
< div class = "line" > < a name = "l00026" > < / a > < span class = "lineno" > 26< / span >   < span class = "comment" > // the first cycles.< / span > < / div >
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< div class = "line" > < a name = "l00027" > < / a > < span class = "lineno" > 27< / span >   std::vector< bool> should_be_deleted(< a class = "code" href = "classoperations__research_1_1_sparse_permutation.html#a8c5fc5af6e649a82d169f61e4dab5e33" > NumCycles< / a > (), < span class = "keyword" > false< / span > );< / div >
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< div class = "line" > < a name = "l00028" > < / a > < span class = "lineno" > 28< / span >   < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > int< / span > i : cycle_indices) {< / div >
< div class = "line" > < a name = "l00029" > < / a > < span class = "lineno" > 29< / span >   DCHECK_GE(i, 0);< / div >
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< div class = "line" > < a name = "l00030" > < / a > < span class = "lineno" > 30< / span >   DCHECK_LT(i, < a class = "code" href = "classoperations__research_1_1_sparse_permutation.html#a8c5fc5af6e649a82d169f61e4dab5e33" > NumCycles< / a > ());< / div >
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< div class = "line" > < a name = "l00031" > < / a > < span class = "lineno" > 31< / span >   DCHECK(!should_be_deleted[i])< / div >
< div class = "line" > < a name = "l00032" > < / a > < span class = "lineno" > 32< / span >   < < < span class = "stringliteral" > " Duplicate index given to RemoveCycles(): " < / span > < < i;< / div >
< div class = "line" > < a name = "l00033" > < / a > < span class = "lineno" > 33< / span >   should_be_deleted[i] = < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00034" > < / a > < span class = "lineno" > 34< / span >   }< / div >
< div class = "line" > < a name = "l00035" > < / a > < span class = "lineno" > 35< / span >   < span class = "keywordtype" > int< / span > new_cycles_size = 0; < span class = "comment" > // new index in cycles_< / span > < / div >
< div class = "line" > < a name = "l00036" > < / a > < span class = "lineno" > 36< / span >   < span class = "keywordtype" > int< / span > new_cycle_ends_size = 0; < span class = "comment" > // new index in cycle_ends_< / span > < / div >
< div class = "line" > < a name = "l00037" > < / a > < span class = "lineno" > 37< / span >   < span class = "keywordtype" > int< / span > start = 0;< / div >
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< div class = "line" > < a name = "l00038" > < / a > < span class = "lineno" > 38< / span >   < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > int< / span > i = 0; i < < a class = "code" href = "classoperations__research_1_1_sparse_permutation.html#a8c5fc5af6e649a82d169f61e4dab5e33" > NumCycles< / a > (); ++i) {< / div >
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< div class = "line" > < a name = "l00039" > < / a > < span class = "lineno" > 39< / span >   < span class = "keyword" > const< / span > < span class = "keywordtype" > int< / span > end = cycle_ends_[i];< / div >
< div class = "line" > < a name = "l00040" > < / a > < span class = "lineno" > 40< / span >   < span class = "keywordflow" > if< / span > (!should_be_deleted[i]) {< / div >
< div class = "line" > < a name = "l00041" > < / a > < span class = "lineno" > 41< / span >   < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > int< / span > j = start; j < end; ++j) {< / div >
< div class = "line" > < a name = "l00042" > < / a > < span class = "lineno" > 42< / span >   cycles_[new_cycles_size++] = cycles_[j];< / div >
< div class = "line" > < a name = "l00043" > < / a > < span class = "lineno" > 43< / span >   }< / div >
< div class = "line" > < a name = "l00044" > < / a > < span class = "lineno" > 44< / span >   cycle_ends_[new_cycle_ends_size++] = new_cycles_size;< / div >
< div class = "line" > < a name = "l00045" > < / a > < span class = "lineno" > 45< / span >   }< / div >
< div class = "line" > < a name = "l00046" > < / a > < span class = "lineno" > 46< / span >   start = end;< / div >
< div class = "line" > < a name = "l00047" > < / a > < span class = "lineno" > 47< / span >   }< / div >
< div class = "line" > < a name = "l00048" > < / a > < span class = "lineno" > 48< / span >   cycles_.resize(new_cycles_size);< / div >
< div class = "line" > < a name = "l00049" > < / a > < span class = "lineno" > 49< / span >   cycle_ends_.resize(new_cycle_ends_size);< / div >
< div class = "line" > < a name = "l00050" > < / a > < span class = "lineno" > 50< / span >   }< / div >
< div class = "line" > < a name = "l00051" > < / a > < span class = "lineno" > 51< / span >   < / div >
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< div class = "line" > < a name = "l00052" > < / a > < span class = "lineno" > < a class = "line" href = "classoperations__research_1_1_sparse_permutation.html#a764be64f3029f8b8e23511061d8de355" > 52< / a > < / span >   std::string < a class = "code" href = "classoperations__research_1_1_sparse_permutation.html#a764be64f3029f8b8e23511061d8de355" > SparsePermutation::DebugString< / a > ()< span class = "keyword" > const < / span > {< / div >
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< div class = "line" > < a name = "l00053" > < / a > < span class = "lineno" > 53< / span >   DCHECK_EQ(cycles_.empty(), cycle_ends_.empty());< / div >
< div class = "line" > < a name = "l00054" > < / a > < span class = "lineno" > 54< / span >   < span class = "keywordflow" > if< / span > (!cycles_.empty()) DCHECK_EQ(cycles_.size(), cycle_ends_.back());< / div >
< div class = "line" > < a name = "l00055" > < / a > < span class = "lineno" > 55< / span >   std::vector< std::vector< int> > cycles;< / div >
< div class = "line" > < a name = "l00056" > < / a > < span class = "lineno" > 56< / span >   < span class = "keywordtype" > int< / span > start = 0;< / div >
< div class = "line" > < a name = "l00057" > < / a > < span class = "lineno" > 57< / span >   < span class = "keywordflow" > for< / span > (< span class = "keyword" > const< / span > < span class = "keywordtype" > int< / span > end : cycle_ends_) {< / div >
< div class = "line" > < a name = "l00058" > < / a > < span class = "lineno" > 58< / span >   < span class = "comment" > // Find the minimum.< / span > < / div >
< div class = "line" > < a name = "l00059" > < / a > < span class = "lineno" > 59< / span >   < span class = "keywordtype" > int< / span > min_pos = start;< / div >
< div class = "line" > < a name = "l00060" > < / a > < span class = "lineno" > 60< / span >   < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > int< / span > i = start + 1; i < end; ++i) {< / div >
< div class = "line" > < a name = "l00061" > < / a > < span class = "lineno" > 61< / span >   < span class = "keywordflow" > if< / span > (cycles_[i] < cycles_[min_pos]) min_pos = i;< / div >
< div class = "line" > < a name = "l00062" > < / a > < span class = "lineno" > 62< / span >   }< / div >
< div class = "line" > < a name = "l00063" > < / a > < span class = "lineno" > 63< / span >   std::vector< int> cycle;< / div >
< div class = "line" > < a name = "l00064" > < / a > < span class = "lineno" > 64< / span >   < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > int< / span > i = min_pos; i < end; ++i) cycle.push_back(cycles_[i]);< / div >
< div class = "line" > < a name = "l00065" > < / a > < span class = "lineno" > 65< / span >   < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > int< / span > i = start; i < min_pos; ++i) cycle.push_back(cycles_[i]);< / div >
< div class = "line" > < a name = "l00066" > < / a > < span class = "lineno" > 66< / span >   cycles.push_back(cycle);< / div >
< div class = "line" > < a name = "l00067" > < / a > < span class = "lineno" > 67< / span >   start = end;< / div >
< div class = "line" > < a name = "l00068" > < / a > < span class = "lineno" > 68< / span >   }< / div >
< div class = "line" > < a name = "l00069" > < / a > < span class = "lineno" > 69< / span >   std::sort(cycles.begin(), cycles.end());< / div >
< div class = "line" > < a name = "l00070" > < / a > < span class = "lineno" > 70< / span >   std::string out;< / div >
< div class = "line" > < a name = "l00071" > < / a > < span class = "lineno" > 71< / span >   < span class = "keywordflow" > for< / span > (< span class = "keyword" > const< / span > std::vector< int> & cycle : cycles) {< / div >
< div class = "line" > < a name = "l00072" > < / a > < span class = "lineno" > 72< / span >   < span class = "keywordflow" > if< / span > (!out.empty()) out += < span class = "stringliteral" > " " < / span > ;< / div >
< div class = "line" > < a name = "l00073" > < / a > < span class = "lineno" > 73< / span >   out += < span class = "stringliteral" > " (" < / span > ;< / div >
< div class = "line" > < a name = "l00074" > < / a > < span class = "lineno" > 74< / span >   out += absl::StrJoin(cycle, < span class = "stringliteral" > " " < / span > );< / div >
< div class = "line" > < a name = "l00075" > < / a > < span class = "lineno" > 75< / span >   out += < span class = "stringliteral" > " )" < / span > ;< / div >
< div class = "line" > < a name = "l00076" > < / a > < span class = "lineno" > 76< / span >   }< / div >
< div class = "line" > < a name = "l00077" > < / a > < span class = "lineno" > 77< / span >   < span class = "keywordflow" > return< / span > out;< / div >
< div class = "line" > < a name = "l00078" > < / a > < span class = "lineno" > 78< / span >   }< / div >
< div class = "line" > < a name = "l00079" > < / a > < span class = "lineno" > 79< / span >   < / div >
< div class = "line" > < a name = "l00080" > < / a > < span class = "lineno" > 80< / span >   } < span class = "comment" > // namespace operations_research< / span > < / div >
< / div > <!-- fragment --> < / div > <!-- contents -->
< / div > <!-- doc - content -->
< div class = "ttc" id = "asparse__permutation_8h_html" > < div class = "ttname" > < a href = "sparse__permutation_8h.html" > sparse_permutation.h< / a > < / div > < / div >
< div class = "ttc" id = "abase_2logging_8h_html" > < div class = "ttname" > < a href = "base_2logging_8h.html" > logging.h< / a > < / div > < / div >
< div class = "ttc" id = "anamespaceoperations__research_html" > < div class = "ttname" > < a href = "namespaceoperations__research.html" > operations_research< / a > < / div > < div class = "ttdoc" > The vehicle routing library lets one model and solve generic vehicle routing problems ranging from th...< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "dense__doubly__linked__list_8h_source.html#l00021" > dense_doubly_linked_list.h:21< / a > < / div > < / div >
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< div class = "ttc" id = "aclassoperations__research_1_1_sparse_permutation_html_a8c5fc5af6e649a82d169f61e4dab5e33" > < div class = "ttname" > < a href = "classoperations__research_1_1_sparse_permutation.html#a8c5fc5af6e649a82d169f61e4dab5e33" > operations_research::SparsePermutation::NumCycles< / a > < / div > < div class = "ttdeci" > int NumCycles() const< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "sparse__permutation_8h_source.html#l00033" > sparse_permutation.h:33< / a > < / div > < / div >
< div class = "ttc" id = "aclassoperations__research_1_1_sparse_permutation_html_a9add43490c45e4334099bb15b6e6eab0" > < div class = "ttname" > < a href = "classoperations__research_1_1_sparse_permutation.html#a9add43490c45e4334099bb15b6e6eab0" > operations_research::SparsePermutation::RemoveCycles< / a > < / div > < div class = "ttdeci" > void RemoveCycles(const std::vector< int > & cycle_indices)< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "sparse__permutation_8cc_source.html#l00023" > sparse_permutation.cc:23< / a > < / div > < / div >
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