diff options
Diffstat (limited to 'graph/dinicScaling.cpp')
| -rw-r--r-- | graph/dinicScaling.cpp | 51 |
1 files changed, 0 insertions, 51 deletions
diff --git a/graph/dinicScaling.cpp b/graph/dinicScaling.cpp deleted file mode 100644 index f4e833a..0000000 --- a/graph/dinicScaling.cpp +++ /dev/null @@ -1,51 +0,0 @@ -struct Edge { - int to, rev; - ll f, c; -}; - -vector<vector<Edge>> adj; -int s, t; -vector<int> pt, dist; - -void addEdge(int u, int v, ll c) { - adj[u].push_back({v, (int)sz(adj[v]), 0, c}); - adj[v].push_back({u, (int)sz(adj[u]) - 1, 0, 0}); -} - -bool bfs(ll lim) { - dist.assign(sz(adj), -1); - dist[s] = 0; - queue<int> q({s}); - while (!q.empty() && dist[t] < 0) { - int v = q.front(); q.pop(); - for (Edge& e : adj[v]) { - if (dist[e.to] < 0 && e.c - e.f >= lim) { - dist[e.to] = dist[v] + 1; - q.push(e.to); - }}} - return dist[t] >= 0; -} - -bool dfs(int v, ll flow) { - if (v == t) return true; - for (; pt[v] < sz(adj[v]); pt[v]++) { - Edge& e = adj[v][pt[v]]; - if (dist[e.to] != dist[v] + 1) continue; - if (e.c - e.f >= flow && dfs(e.to, flow)) { - e.f += flow; - adj[e.to][e.rev].f -= flow; - return true; - }} - return false; -} - -ll maxFlow(int source, int target) { - s = source, t = target; - ll flow = 0; - for (ll lim = (1LL << 62); lim >= 1; lim /= 2) { - while (bfs(lim)) { - pt.assign(sz(adj), 0); - while (dfs(s, lim)) flow += lim; - }} - return flow; -} |
