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95
S2OJ/1506/1506.cpp
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95
S2OJ/1506/1506.cpp
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#include <iostream>
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#include <stack>
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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 = 205;
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int n, ans;
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bool g[N][N], g2[N][N];
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// Tarjan
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int cnt, dfn[N], low[N];
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int scc_cnt, id[N], siz[N];
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int dout[N], din[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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st.push(u);
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vis[u] = true;
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for (int i = 1; i <= n; i++) {
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if (!g[u][i]) continue;
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if (!dfn[i]) {
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tarjan(i);
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low[u] = std::min(low[u], low[i]);
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} else if (vis[i]) {
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low[u] = std::min(low[u], dfn[i]);
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}
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}
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if (dfn[u] == low[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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siz[scc_cnt]++;
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} while (v != u);
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if (siz[scc_cnt] > 1) ans += siz[scc_cnt];
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}
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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;
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for (int i = 1; i <= n; i++) {
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for (int j = 1; j <= n; j++) {
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cin >> g[i][j];
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}
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}
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for (int i = 1; i <= n; i++) {
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if (!dfn[i]) tarjan(i);
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}
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for (int i = 1; i <= n; i++) {
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for (int j = 1; j <= n; j++) {
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if (g[i][j] && id[i] != id[j]) {
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g2[id[i]][id[j]] = true;
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}
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}
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}
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for (int i = 1; i <= scc_cnt; i++) {
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for (int j = 1; j <= scc_cnt; j++) {
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for (int k = 1; k <= scc_cnt; k++) {
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if (i != j && j != k && g2[i][k] && g2[k][j]) {
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g2[i][j] = false;
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}
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}
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}
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}
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for (int i = 1; i <= scc_cnt; i++) {
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for (int j = 1; j <= scc_cnt; j++) {
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if (g2[i][j]) ans++;
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}
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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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