/**
* Return maxflow from ini to end
*/
int maxflow(int ini, int end) {
flow = vi(SZ(dest));
int F = 0;
while (MFbfs(ini, end)) while (true) {
int tmp = MFdfs(ini, end, INF);
F += tmp;
if (tmp == 0) break;
}
return F;
}
int maxflow(int ini, int end) {
if (_ini != ini || _end != end) {
flow = vi(sz(dest));
_ini = ini;
_end = end;
}
while (MFbfs(ini, end))
while (MFdfs(ini, end, INF));
int F = 0;
for (int a : adj[ini]) F += flow[a];
return F;
}
int MFdfs(int u, int t, int f) {
if (u == t) return f;
for(int &i = curAdj[u]; i < adj[u].size(); ++i) {
int ar = adj[u][i], v = dest[ar];
if (d[v] != d[u]+1 || capres(ar) == 0) continue;
int tmpF = MFdfs(v, t, min(f, capres(ar)));
if (tmpF) {
flow[ar] += tmpF;
flow[inv(ar)] -= tmpF;
return tmpF;
}
}
return 0;
}