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121
S2OJ/1363/1363.cpp
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121
S2OJ/1363/1363.cpp
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#include <iostream>
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#include <functional>
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#include <queue>
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#include <tuple>
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#include <vector>
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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 INF = 0x3f3f3f3f;
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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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int t;
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cin >> t;
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while (t--) {
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int n, m;
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cin >> n >> m;
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int s = 0, t = 1;
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std::vector<int> a(n + 1), pre(n + 1), head((m + 1) << 1, -1);
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std::vector<std::tuple<int, int, int>> edges;
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for (int i = 1; i <= n; i++) {
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cin >> a[i];
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}
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std::function<void(int, int, int)> add = [&](int u, int v, int w) -> void {
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edges.emplace_back(v, w, head[u]);
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head[u] = edges.size() - 1;
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};
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for (int i = 1, x, y; i <= m; i++) {
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cin >> x >> y;
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add(i << 1, i << 1 | 1, 1);
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add(i << 1 | 1, i << 1, 1);
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add(pre[x], i << 1, pre[x] ? a[x] : 1);
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add(i << 1, pre[x], 0);
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pre[x] = i << 1;
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add(pre[y], i << 1 | 1, pre[y] ? a[y] : 1);
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add(i << 1 | 1, pre[y], 0);
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pre[y] = i << 1 | 1;
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}
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add(pre[1], t, a[1]);
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add(t, pre[1], 0);
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std::vector<int> dist((m + 1) << 1);
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std::function<bool()> bfs = [&]() -> bool {
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std::fill(dist.begin(), dist.end(), 0);
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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 = std::get<2>(edges[i])) {
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int v = std::get<0>(edges[i]),
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w = std::get<1>(edges[i]);
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if (!dist[v] && w) {
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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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std::function<int(int, int)> dinic = [&](int u, int limit) -> int {
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if (u == t) return limit;
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int flow = 0;
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for (int i = head[u]; ~i; i = std::get<2>(edges[i])) {
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int v = std::get<0>(edges[i]),
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w = std::get<1>(edges[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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std::get<1>(edges[i]) -= k;
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std::get<1>(edges[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 res = 0;
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while (bfs()) {
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while (int flow = dinic(s, INF)) res += flow;
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}
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cout << res << endl;
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}
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return 0;
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}
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