This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
#define int short
#define pb push_back
#define ff first
#define ss second
#define all(v) v.begin(), v.end()
#define rall(v) v.rbegin(), v.rend()
#define sz(v) (int)v.size()
//const int INF = 1e18;
//const int mod = 998244353;
//const int N = 1e5+5;
int n;
vector<vector<pair<int,int>>> adj;
vector<bool> visited;
vector<int> tin, low;
int timer;
map<pair<int,int>,bool> bridge;
void IS_BRIDGE(int u, int v){
cout << u + 1 << ' ' << v + 1 << '\n';
}
void dfs(int v, int ind = -1) {
visited[v] = true;
tin[v] = low[v] = timer++;
for (auto [to, nxt] : adj[v]) {
if (nxt == ind) continue;
if (visited[to]) {
low[v] = min(low[v], tin[to]);
} else {
dfs(to, nxt);
low[v] = min(low[v], low[to]);
if (low[to] > tin[v])
IS_BRIDGE(v, to);
}
}
}
void find_bridges() {
timer = 0;
visited.assign(n, false);
tin.assign(n, -1);
low.assign(n, -1);
for (int i = 0; i < n; ++i) {
if (!visited[i])
dfs(i);
}
}
void solve(){
cin >> n;
int m; cin >> m;
adj.resize(n);
for(int i = 0; i < m; i++){
int u, v; cin >> u >> v;
u--; v--;
adj[u].pb({v, i});
adj[v].pb({u, i});
}
find_bridges();
}
main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int tt = 1;
//cin >> tt;
while (tt--) {
solve();
}
}
Compilation message (stderr)
pipes.cpp:67:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
67 | main(){
| ^~~~
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