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S2OJ/1991/1991.cpp
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#include <iostream>
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#include <algorithm>
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#include <queue>
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#include <stack>
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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 N = 1e4 + 5;
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const int INF = 0x3f3f3f3f;
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int n, m, a[N];
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std::vector<int> g[N], g2[N];
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int cnt, dfn[N], low[N];
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int scc_cnt, id[N], w[N], dist[N];
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bool vis[N];
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std::stack<int> st;
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void tarjan(int u) {
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dfn[u] = low[u] = ++cnt;
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vis[u] = true;
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st.push(u);
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for (int v : g[u]) {
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if (!dfn[v]) {
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tarjan(v);
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low[u] = std::min(low[u], low[v]);
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} else if (vis[v]) {
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low[u] = std::min(low[u], dfn[v]);
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}
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}
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if (low[u] == dfn[u]) {
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scc_cnt++;
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int v;
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do {
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v = st.top();
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st.pop();
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vis[v] = false;
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id[v] = scc_cnt;
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w[scc_cnt] += a[v];
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} while (v != u);
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}
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}
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int spfa(int s) {
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std::fill_n(dist, N, -INF);
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int res = 0;
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std::queue<int> q;
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q.emplace(s);
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dist[s] = 0;
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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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res = std::max(res, dist[u] + w[u]);
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for (int v : g2[u]) {
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if (dist[v] < dist[u] + w[u]) {
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dist[v] = dist[u] + w[u];
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q.push(v);
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}
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}
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}
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return res;
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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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cin >> n >> m;
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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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for (int i = 1, u, v; i <= m; i++) {
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cin >> u >> v;
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g[u].emplace_back(v);
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}
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for (int i = 1; i <= n; i++) {
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if (!dfn[i]) {
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tarjan(i);
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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 v : g[i]) {
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if (id[i] != id[v]) {
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g2[id[i]].emplace_back(id[v]);
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}
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}
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}
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int ans = 0;
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for (int i = 1; i <= scc_cnt; i++) {
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ans = std::max(ans, spfa(i));
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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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/**
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* @file S2OJ/1991/gen.cpp
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* @author Baoshuo <i@baoshuo.ren>
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* @url https://baoshuo.ren
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* @license GPL-3.0
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* @date 2023-03-30
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*/
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#include "testlib.h"
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#include <iostream>
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#include <limits>
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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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#define N_TESTS 20
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#define PERCENT_TESTS(_percent) (static_cast<double>(_percent) / 100 * N_TESTS)
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int main(int argc, char* argv[]) {
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registerGen(argc, argv, 1);
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int id = opt<int>("id");
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int min_n = 10000,
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max_n = 10000; // 1e4
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int min_m = 10000,
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max_m = 10000; // 1e4
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if (id <= PERCENT_TESTS(50)) {
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min_n = max_n = 100;
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min_m = max_m = 100;
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} else { // all tests
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// (none)
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}
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int n = rnd.next(min_n, max_n);
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int m = rnd.next(min_m, max_m);
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cout << n << ' ' << m << endl;
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for (int i = 1; i <= n; i++) {
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const char end_c = i < n ? ' ' : '\n';
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cout << rnd.next(0, 1000) << end_c;
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}
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for (int i = 1; i <= m; i++) {
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int u = rnd.next(1, n);
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int v = rnd.next(1, n);
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cout << u << ' ' << v << endl;
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}
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return 0;
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}
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