이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <bits/stdc++.h>
using namespace std;
//#define int long long
#define all(x) x.begin(), x.end()
#define size(x) (int)x.size()
template<class S, class T>
bool chmin(S &a, const T &b) {
return a > b ? (a = b) == b : false;
}
template<class S, class T>
bool chmax(S &a, const T &b) {
return a < b ? (a = b) == b : false;
}
const int N = 5000;
bool r[N][N], us[N][N], mul[N][N], vis[N];
int tin[N], fup[N], timer;
vector<pair<short, short>> bridges;
short n; int m;
void dfs(short v, short p = -1) {
vis[v] = true;
tin[v] = fup[v] = ++timer;
for (short to = 0; to < n; ++to) {
if (to == p || to == v || !r[v][to]) continue;
else if (vis[to]) chmin(fup[v], tin[to]);
else {
dfs(to, v);
chmin(fup[v], fup[to]);
if (fup[to] > tin[v]) {
bridges.push_back({v, to});
}
}
}
}
signed main() {
cin.tie(nullptr)->sync_with_stdio(false);
cin >> n >> m;
for (int i = 0; i < m; ++i) {
short a, b; cin >> a >> b;
a--, b--;
r[a][b] = r[b][a] = true;
if (us[a][b]) mul[a][b] = mul[b][a] = true;
us[a][b] = us[b][a] = true;
}
for (short i = 0; i < n; ++i) {
if (!vis[i]) dfs(i);
}
for (auto [a, b] : bridges) {
if (!mul[a][b]) {
cout << a + 1 << ' ' << b + 1 << '\n';
}
}
}
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