Changeset 655:6ac5d9ae1d3d in lemon for lemon/network_simplex.h
 Timestamp:
 04/03/09 18:59:15 (10 years ago)
 Branch:
 default
 Phase:
 public
 File:

 1 edited
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lemon/network_simplex.h
r654 r655 55 55 /// algorithm. By default it is the same as \c F. 56 56 /// 57 /// \warning Both value types must be signed integer types. 57 /// \warning Both value types must be signed and all input data must 58 /// be integer. 58 59 /// 59 60 /// \note %NetworkSimplex provides five different pivot rule … … 1045 1046 1046 1047 // Initialize arc maps 1047 Flow max_cap = std::numeric_limits<Flow>::max(); 1048 Cost max_cost = std::numeric_limits<Cost>::max() / 4; 1048 Flow inf_cap = 1049 std::numeric_limits<Flow>::has_infinity ? 1050 std::numeric_limits<Flow>::infinity() : 1051 std::numeric_limits<Flow>::max(); 1049 1052 if (_pupper && _pcost) { 1050 1053 for (int i = 0; i != _arc_num; ++i) { … … 1070 1073 } else { 1071 1074 for (int i = 0; i != _arc_num; ++i) 1072 _cap[i] = max_cap;1075 _cap[i] = inf_cap; 1073 1076 } 1074 1077 if (_pcost) { … … 1079 1082 _cost[i] = 1; 1080 1083 } 1084 } 1085 1086 // Initialize artifical cost 1087 Cost art_cost; 1088 if (std::numeric_limits<Cost>::is_exact) { 1089 art_cost = std::numeric_limits<Cost>::max() / 4 + 1; 1090 } else { 1091 art_cost = std::numeric_limits<Cost>::min(); 1092 for (int i = 0; i != _arc_num; ++i) { 1093 if (_cost[i] > art_cost) art_cost = _cost[i]; 1094 } 1095 art_cost = (art_cost + 1) * _node_num; 1081 1096 } 1082 1097 … … 1101 1116 _parent[u] = _root; 1102 1117 _pred[u] = e; 1103 _cost[e] = max_cost;1104 _cap[e] = max_cap;1118 _cost[e] = art_cost; 1119 _cap[e] = inf_cap; 1105 1120 _state[e] = STATE_TREE; 1106 1121 if (_supply[u] >= 0) { 1107 1122 _flow[e] = _supply[u]; 1108 1123 _forward[u] = true; 1109 _pi[u] =  max_cost;1124 _pi[u] = art_cost; 1110 1125 } else { 1111 1126 _flow[e] = _supply[u]; 1112 1127 _forward[u] = false; 1113 _pi[u] = max_cost;1128 _pi[u] = art_cost; 1114 1129 } 1115 1130 } … … 1328 1343 _pi[v_in]  _pi[u_in]  _cost[_pred[u_in]] : 1329 1344 _pi[v_in]  _pi[u_in] + _cost[_pred[u_in]]; 1330 if (_succ_num[u_in] > _node_num / 2) { 1331 // Update in the upper subtree (which contains the root) 1332 int before = _rev_thread[u_in]; 1333 int after = _thread[_last_succ[u_in]]; 1334 _thread[before] = after; 1335 _pi[_root] = sigma; 1336 for (int u = _thread[_root]; u != _root; u = _thread[u]) { 1337 _pi[u] = sigma; 1338 } 1339 _thread[before] = u_in; 1340 } else { 1341 // Update in the lower subtree (which has been moved) 1342 int end = _thread[_last_succ[u_in]]; 1343 for (int u = u_in; u != end; u = _thread[u]) { 1344 _pi[u] += sigma; 1345 } 1345 // Update potentials in the subtree, which has been moved 1346 int end = _thread[_last_succ[u_in]]; 1347 for (int u = u_in; u != end; u = _thread[u]) { 1348 _pi[u] += sigma; 1346 1349 } 1347 1350 }
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