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Add min cost flow functionality to ch9/mcmf.cpp #111

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Add min cost flow functionality to ch9/mcmf.cpp #111

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6 changes: 3 additions & 3 deletions ch9/mcmf.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -82,11 +82,11 @@ class min_cost_max_flow {
if (!directed) add_edge(v, u, w, c); // add again in reverse
}

pair<ll, ll> mcmf(int s, int t) {
pair<ll, ll> mcmf(int s, int t, ll flow_limit = (ll)1e18) {
ll mf = 0; // mf stands for max_flow
while (SPFA(s, t)) { // an O(V^2*E) algorithm
while (SPFA(s, t) && mf < flow_limit) { // an O(V^2*E) algorithm
last.assign(V, 0); // important speedup
while (ll f = DFS(s, t)) // exhaust blocking flow
while (ll f = DFS(s, t, flow_limit - f)) // exhaust blocking flow
mf += f;
}
return {mf, total_cost};
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