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OI-codes/Luogu/P2194/P2194.cpp
2022-01-02 21:35:33 +08:00

75 lines
1.5 KiB
C++

#include <iostream>
#include <stack>
#include <vector>
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<int> g[N];
// Tarjan
int cnt, dfn[N], low[N];
int scc_cnt, id[N];
std::stack<int> 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;
}