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>
#define lint long long int
#define dint long double
#define ll long long
#define endl "\n"
#define pii pair<int, int>
#define pb push_back
#define F first
#define S second
using namespace std;
const int MOD = (int)1e9 + 23;
const int MAXN = (int)1e5 + 23;
const int MAX_LOG = 17 + 1;
const int INF = (int)1e9 + 23;
int n, m, tmp, tmp2, u, v;
int par1[MAXN], par2[MAXN], sz1[MAXN], sz2[MAXN], h[MAXN], dp[MAXN], seen[MAXN], googool[MAXN], p[MAXN];
vector<pii> adj[MAXN];
int get_par1(int v) {
return (par1[v] == -1? v : par1[v] = get_par1(par1[v]));
}
int get_par2(int v) {
return (par2[v] == -1? v : par2[v] = get_par2(par2[v]));
}
bool merge1(int u, int v) {
u = get_par1(u);
v = get_par1(v);
if (u == v) return 0;
par1[u] = v;
return 1;
}
bool merge2(int u, int v) {
u = get_par2(u);
v = get_par2(v);
if (u == v) return 0;
par2[u] = v;
return 1;
}
void DFS(int v) {
seen[v] = 1;
for(auto w:adj[v]) {
int u = w.F;
int ind=w.S;
if(seen[u]){
if(googool[ind] == 0 && h[u] < (h[v])){
dp[v]++;
dp[u]--;
}
continue;
}
h[u] = h[v] + 1;
p[u] = v;
googool[ind] = 1;
DFS(u);
dp[v] += dp[u];
}
}
int32_t main() {
ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
cin >> n >> m;
fill(par1, par1+n+1, -1);
fill(par2, par2+n+1, -1);
tmp = 1;
for (int i=1; i<=m; i++) {
cin >> u >> v;
if (merge1(u, v)) {
adj[u].pb({v, tmp});
adj[v].pb({u, tmp});
tmp++;
} else if (merge2(u, v)) {
adj[u].pb({v, tmp});
adj[v].pb({u, tmp});
tmp++;
}
}
for (int i=1; i<=n; i++) {
if (!seen[i]) {
DFS(i);
}
}
for (int i=1; i<=n ; i++) {
if (!dp[i] && p[i]) {
cout << p[i] << " " << i << endl;
}
}
return 0;
}
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