diff --git a/Luogu/P2194/P2194.cpp b/Luogu/P2194/P2194.cpp new file mode 100644 index 00000000..a2a54b26 --- /dev/null +++ b/Luogu/P2194/P2194.cpp @@ -0,0 +1,74 @@ +#include +#include +#include + +using std::cin; +using std::cout; +using std::endl; + +const int N = 100005; +const int mod = 1e9 + 7; + +int n, m, u, v, a[N], ans1, ans2; +std::vector g[N]; + +// Tarjan +int cnt, dfn[N], low[N]; +int scc_cnt, id[N]; +std::stack st; +bool vis[N]; +int w[N], s[N]; + +void tarjan(int u) { + dfn[u] = low[u] = ++cnt; + st.push(u); + vis[u] = true; + for (int v : g[u]) { + if (!dfn[v]) { + tarjan(v); + low[u] = std::min(low[u], low[v]); + } else if (vis[v]) { + low[u] = std::min(low[u], dfn[v]); + } + } + if (low[u] == dfn[u]) { + scc_cnt++; + int v; + do { + v = st.top(); + st.pop(); + vis[v] = false; + if (w[scc_cnt] > a[v]) { + w[scc_cnt] = a[v]; + s[scc_cnt] = 1; + } else if (w[scc_cnt] == a[v]) { + s[scc_cnt]++; + } + } while (v != u); + } +} + +int main() { + ans2 = 1; + std::fill(w, w + N, 0x3f3f3f3f); + cin >> n; + for (int i = 1; i <= n; i++) { + cin >> a[i]; + } + cin >> m; + for (int i = 1; i <= m; i++) { + cin >> u >> v; + g[u].push_back(v); + } + for (int i = 1; i <= n; i++) { + if (!dfn[i]) { + tarjan(i); + } + } + for (int i = 1; i <= scc_cnt; i++) { + ans1 += w[i]; + ans2 = ans2 * s[i] % mod; + } + cout << ans1 << ' ' << ans2 << endl; + return 0; +}