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1001. [BeiJing2006]狼抓兔子
https://hydro.ac/d/bzoj/record/63c3fcfe53dc8ec11aa0d398
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BZOJ/1001/1001.cpp
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128
BZOJ/1001/1001.cpp
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#include <iostream>
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#include <algorithm>
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#include <iterator>
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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 = 1005,
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M = N * N;
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const int INF = 0x3f3f3f3f;
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int n, m, s, t, ans;
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int idx, head[M], edge[M << 3], ver[M << 3], next[M << 3];
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int dist[M], cur[M];
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int id(int x, int y) {
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return (x - 1) * m + y;
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}
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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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std::fill(std::begin(dist), std::end(dist), 0);
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std::copy(std::begin(head), std::end(head), std::begin(cur));
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std::queue<int> q;
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q.emplace(s);
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dist[s] = 1;
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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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if (v == t) return true;
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q.emplace(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 (dist[v] == dist[u] + 1 && w) {
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int k = dinic(v, std::min(w, limit - flow));
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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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std::fill(std::begin(head), std::end(head), -1);
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cin >> n >> m;
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s = id(1, 1), t = id(n, m);
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for (int i = 1; i <= n; i++) {
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for (int j = 1, x; j < m; j++) {
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cin >> x;
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add(id(i, j), id(i, j + 1), x);
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add(id(i, j + 1), id(i, j),x);
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}
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}
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for (int i = 1; i < n; i++) {
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for (int j = 1, x; j <= m; j++) {
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cin >> x;
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add(id(i, j), id(i + 1, j), x);
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add(id(i + 1, j), id(i, j), x);
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}
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}
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for (int i = 1; i < n; i++) {
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for (int j = 1, x; j < m; j++) {
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cin >> x;
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add(id(i, j), id(i + 1, j + 1), x);
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add(id(i + 1, j + 1), id(i, j), x);
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}
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}
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while (bfs()) {
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while (int flow = dinic(s, INF)) ans += flow;
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}
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cout << ans << endl;
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return 0;
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}
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