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1391. [Ceoi2008]order
https://hydro.ac/d/bzoj/record/6322c9dabdf9bc31d1607e4d
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126
BZOJ/1391/1391.cpp
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126
BZOJ/1391/1391.cpp
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#pragma GCC optimize("Ofast")
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#include <iostream>
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#include <cstring>
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#include <limits>
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#include <queue>
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using std::cin;
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using std::cout;
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const char endl = '\n';
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const int N = 2e6 + 5;
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int n, m, s, t, sum;
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int idx, head[N], edge[N << 1], ver[N << 1], next[N << 1];
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int dist[N], cur[N];
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void add(int u, int v, int w) {
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next[idx] = head[u];
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ver[idx] = v;
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edge[idx] = w;
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head[u] = idx++;
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}
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bool bfs() {
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memset(dist, 0x00, sizeof(dist));
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std::queue<int> q;
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dist[s] = 1;
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q.push(s);
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cur[s] = head[s];
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while (!q.empty()) {
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int u = q.front();
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q.pop();
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for (int i = head[u]; ~i; i = next[i]) {
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int v = ver[i],
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w = edge[i];
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if (w && !dist[v]) {
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dist[v] = dist[u] + 1;
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cur[v] = head[v];
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if (v == t) return true;
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q.push(v);
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}
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}
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}
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return false;
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}
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int dinic(int u, int limit) {
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if (u == t) return limit;
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int flow = 0;
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for (int i = cur[u]; ~i && flow < limit; i = next[i]) {
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cur[u] = i;
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int v = ver[i],
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w = edge[i];
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if (w && dist[v] == dist[u] + 1) {
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int k = dinic(v, std::min(limit - flow, w));
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if (!k) dist[v] = 0;
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edge[i] -= k;
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edge[i ^ 1] += k;
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flow += k;
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}
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}
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return flow;
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}
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int main() {
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std::ios::sync_with_stdio(false);
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cin.tie(nullptr);
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memset(head, 0xff, sizeof(head));
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cin >> n >> m;
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s = 0, t = n + m + 1;
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for (int i = 1; i <= n; i++) {
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int x, t;
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cin >> x >> t;
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add(s, i, x);
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add(i, s, 0);
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sum += x;
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for (int j = 1; j <= t; j++) {
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int a, b;
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cin >> a >> b;
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add(i, a + n, b);
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add(a + n, i, 0);
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}
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}
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for (int i = 1; i <= m; i++) {
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int y;
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cin >> y;
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add(i + n, t, y);
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add(t, i + n, 0);
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}
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int res = 0, flow;
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while (bfs()) {
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while (flow = dinic(s, std::numeric_limits<int>::max())) res += flow;
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}
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cout << sum - res << endl;
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return 0;
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}
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