r606:c7d160f73d52
Wed, 25 Mar 2009 21:37:50
[Not Reviewed]
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@@ -41,12 +41,18 @@ |
| 41 | 41 |
/// |
| 42 | 42 |
/// \ref NetworkSimplex implements the primal Network Simplex algorithm |
| 43 | 43 |
/// for finding a \ref min_cost_flow "minimum cost flow". |
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/// This algorithm is a specialized version of the linear programming |
|
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/// simplex method directly for the minimum cost flow problem. |
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/// It is one of the most efficient solution methods. |
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/// |
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/// In general this class is the fastest implementation available |
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/// in LEMON for the minimum cost flow problem. |
|
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/// |
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/// \tparam GR The digraph type the algorithm runs on. |
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/// \tparam V The value type used in the algorithm. |
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/// By default it is \c int. |
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/// |
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/// \warning |
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/// \warning The value type must be a signed integer type. |
|
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/// |
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/// \note %NetworkSimplex provides five different pivot rule |
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/// implementations. For more information see \ref PivotRule. |
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@@ -789,7 +795,7 @@ |
| 789 | 795 |
/// |
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/// This function runs the algorithm. |
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/// The paramters can be specified using \ref lowerMap(), |
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/// \ref upperMap(), \ref capacityMap(), \ref boundMaps(), |
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/// \ref upperMap(), \ref capacityMap(), \ref boundMaps(), |
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/// \ref costMap(), \ref supplyMap() and \ref stSupply() |
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/// functions. For example, |
| 795 | 801 |
/// \code |
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@@ -798,6 +804,11 @@ |
| 798 | 804 |
/// .supplyMap(sup).run(); |
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/// \endcode |
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/// |
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/// This function can be called more than once. All the parameters |
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/// that have been given are kept for the next call, unless |
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/// \ref reset() is called, thus only the modified parameters |
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/// have to be set again. See \ref reset() for examples. |
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/// |
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| 801 | 812 |
/// \param pivot_rule The pivot rule that will be used during the |
| 802 | 813 |
/// algorithm. For more information see \ref PivotRule. |
| 803 | 814 |
/// |
| ... | ... |
@@ -806,6 +817,51 @@ |
| 806 | 817 |
return init() && start(pivot_rule); |
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} |
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|
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/// \brief Reset all the parameters that have been given before. |
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/// |
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/// This function resets all the paramaters that have been given |
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/// using \ref lowerMap(), \ref upperMap(), \ref capacityMap(), |
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/// \ref boundMaps(), \ref costMap(), \ref supplyMap() and |
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/// \ref stSupply() functions before. |
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/// |
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/// It is useful for multiple run() calls. If this function is not |
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/// used, all the parameters given before are kept for the next |
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/// \ref run() call. |
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/// |
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/// For example, |
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/// \code |
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/// NetworkSimplex<ListDigraph> ns(graph); |
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/// |
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/// // First run |
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/// ns.lowerMap(lower).capacityMap(cap).costMap(cost) |
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/// .supplyMap(sup).run(); |
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/// |
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/// // Run again with modified cost map (reset() is not called, |
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/// // so only the cost map have to be set again) |
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/// cost[e] += 100; |
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/// ns.costMap(cost).run(); |
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/// |
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/// // Run again from scratch using reset() |
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/// // (the lower bounds will be set to zero on all arcs) |
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/// ns.reset(); |
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/// ns.capacityMap(cap).costMap(cost) |
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/// .supplyMap(sup).run(); |
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/// \endcode |
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/// |
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/// \return <tt>(*this)</tt> |
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NetworkSimplex& reset() {
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delete _plower; |
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delete _pupper; |
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delete _pcost; |
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delete _psupply; |
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_plower = NULL; |
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_pupper = NULL; |
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_pcost = NULL; |
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_psupply = NULL; |
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_pstsup = false; |
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return *this; |
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} |
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|
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/// @} |
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|
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/// \name Query Functions |
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@@ -920,8 +976,8 @@ |
| 920 | 976 |
_cap.resize(all_arc_num); |
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_cost.resize(all_arc_num); |
| 922 | 978 |
_supply.resize(all_node_num); |
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_flow.resize(all_arc_num, 0); |
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_pi.resize(all_node_num, 0); |
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_flow.resize(all_arc_num); |
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_pi.resize(all_node_num); |
|
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|
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_parent.resize(all_node_num); |
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_pred.resize(all_node_num); |
| ... | ... |
@@ -930,7 +986,7 @@ |
| 930 | 986 |
_rev_thread.resize(all_node_num); |
| 931 | 987 |
_succ_num.resize(all_node_num); |
| 932 | 988 |
_last_succ.resize(all_node_num); |
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_state.resize(all_arc_num |
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_state.resize(all_arc_num); |
|
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|
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// Initialize node related data |
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bool valid_supply = true; |
| ... | ... |
@@ -986,12 +1042,16 @@ |
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_target[i] = _node_id[_graph.target(e)]; |
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_cap[i] = (*_pupper)[e]; |
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_cost[i] = (*_pcost)[e]; |
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_flow[i] = 0; |
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_state[i] = STATE_LOWER; |
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} |
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} else {
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for (int i = 0; i != _arc_num; ++i) {
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Arc e = _arc_ref[i]; |
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_source[i] = _node_id[_graph.source(e)]; |
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_target[i] = _node_id[_graph.target(e)]; |
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_flow[i] = 0; |
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_state[i] = STATE_LOWER; |
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} |
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if (_pupper) {
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for (int i = 0; i != _arc_num; ++i) |
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@@ -1032,6 +1092,9 @@ |
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_last_succ[u] = u; |
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_parent[u] = _root; |
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_pred[u] = e; |
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_cost[e] = max_cost; |
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_cap[e] = max_cap; |
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_state[e] = STATE_TREE; |
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if (_supply[u] >= 0) {
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_flow[e] = _supply[u]; |
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_forward[u] = true; |
| ... | ... |
@@ -1041,9 +1104,6 @@ |
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_forward[u] = false; |
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_pi[u] = max_cost; |
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} |
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_cost[e] = max_cost; |
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_cap[e] = max_cap; |
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_state[e] = STATE_TREE; |
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} |
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|
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return true; |
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@@ -89,7 +89,8 @@ |
| 89 | 89 |
|
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MCF mcf(g); |
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b = mcf. |
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b = mcf.reset() |
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.lowerMap(lower) |
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.upperMap(upper) |
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.capacityMap(upper) |
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.boundMaps(lower, upper) |
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@@ -242,46 +243,44 @@ |
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|
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// A. Test NetworkSimplex with the default pivot rule |
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{
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NetworkSimplex<Digraph> mcf1(gr), mcf2(gr), mcf3(gr), mcf4(gr), |
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mcf5(gr), mcf6(gr), mcf7(gr), mcf8(gr); |
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NetworkSimplex<Digraph> mcf(gr); |
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|
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mcf.upperMap(u).costMap(c); |
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checkMcf(mcf, mcf.supplyMap(s1).run(), |
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gr, l1, u, c, s1, true, 5240, "#A1"); |
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checkMcf( |
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checkMcf(mcf, mcf.stSupply(v, w, 27).run(), |
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gr, l1, u, c, s2, true, 7620, "#A2"); |
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|
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mcf.lowerMap(l2); |
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checkMcf(mcf, mcf.supplyMap(s1).run(), |
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gr, l2, u, c, s1, true, 5970, "#A3"); |
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checkMcf( |
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checkMcf(mcf, mcf.stSupply(v, w, 27).run(), |
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gr, l2, u, c, s2, true, 8010, "#A4"); |
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|
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mcf.reset(); |
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checkMcf(mcf, mcf.supplyMap(s1).run(), |
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gr, l1, cu, cc, s1, true, 74, "#A5"); |
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checkMcf( |
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checkMcf(mcf, mcf.lowerMap(l2).stSupply(v, w, 27).run(), |
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gr, l2, cu, cc, s2, true, 94, "#A6"); |
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|
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mcf.reset(); |
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checkMcf(mcf, mcf.run(), |
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gr, l1, cu, cc, s3, true, 0, "#A7"); |
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checkMcf( |
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checkMcf(mcf, mcf.boundMaps(l2, u).run(), |
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gr, l2, u, cc, s3, false, 0, "#A8"); |
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} |
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|
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// B. Test NetworkSimplex with each pivot rule |
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{
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NetworkSimplex<Digraph> mcf1(gr), mcf2(gr), mcf3(gr), mcf4(gr), mcf5(gr); |
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NetworkSimplex<Digraph>::PivotRule pr; |
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NetworkSimplex<Digraph> mcf(gr); |
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mcf.supplyMap(s1).costMap(c).capacityMap(u).lowerMap(l2); |
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pr = NetworkSimplex<Digraph>::FIRST_ELIGIBLE; |
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checkMcf(mcf1, mcf1.boundMaps(l2, u).costMap(c).supplyMap(s1).run(pr), |
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checkMcf(mcf, mcf.run(NetworkSimplex<Digraph>::FIRST_ELIGIBLE), |
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gr, l2, u, c, s1, true, 5970, "#B1"); |
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pr = NetworkSimplex<Digraph>::BEST_ELIGIBLE; |
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checkMcf(mcf2, mcf2.boundMaps(l2, u).costMap(c).supplyMap(s1).run(pr), |
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checkMcf(mcf, mcf.run(NetworkSimplex<Digraph>::BEST_ELIGIBLE), |
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gr, l2, u, c, s1, true, 5970, "#B2"); |
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pr = NetworkSimplex<Digraph>::BLOCK_SEARCH; |
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checkMcf(mcf3, mcf3.boundMaps(l2, u).costMap(c).supplyMap(s1).run(pr), |
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checkMcf(mcf, mcf.run(NetworkSimplex<Digraph>::BLOCK_SEARCH), |
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gr, l2, u, c, s1, true, 5970, "#B3"); |
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pr = NetworkSimplex<Digraph>::CANDIDATE_LIST; |
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checkMcf(mcf4, mcf4.boundMaps(l2, u).costMap(c).supplyMap(s1).run(pr), |
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checkMcf(mcf, mcf.run(NetworkSimplex<Digraph>::CANDIDATE_LIST), |
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gr, l2, u, c, s1, true, 5970, "#B4"); |
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pr = NetworkSimplex<Digraph>::ALTERING_LIST; |
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checkMcf(mcf5, mcf5.boundMaps(l2, u).costMap(c).supplyMap(s1).run(pr), |
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checkMcf(mcf, mcf.run(NetworkSimplex<Digraph>::ALTERING_LIST), |
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gr, l2, u, c, s1, true, 5970, "#B5"); |
| 286 | 285 |
} |
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