제출 #857858

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
857858		UmairAhmadMirza	Pipes (CEOI15_pipes)	C++17	0 / 100	5048 ms	33200 KiB

pipes

//In the name of Allah the most beneficent, the most merciful.
#include <bits/stdc++.h>

using namespace std;

// #pragma GCC optimize("Ofast,unroll-loops") 
// #pragma GCC target("avx,avx2,avx512,fma") 
#define int long long
#define ar array
#define ll long long
#define ld long double
#define sza(x) ((int)x.size())
#define all(a) (a).begin(), (a).end()

#define PI 3.1415926535897932384626433832795l 
const int N = 5005;
const ll MOD = 1e9 + 7;
const ll INF = 1e9;
const ld EPS = 1e-9;

// -------------------------<RNG>------------------------- 
// RANDOM NUMBER GENERATOR
mt19937 RNG(chrono::steady_clock::now().time_since_epoch().count());  
#define SHUF(v) shuffle(all(v), RNG); 
// Use mt19937_64 for 64 bit random numbers.
//--------------------------------------------------------
vector<int> adj[N];
int e1,e2;
bool vis[N];
int n,m;
void dfs(int node){
	vis[node]=1;
	for(auto i:adj[node]){
		if((node==e1&&i==e2) || (node==e2&&i==e1))
			continue;
		if(!vis[i])
			dfs(i);
	}
}
bool check(pair<int,int> e){
	e1=e.first;
	e2=e.second;
	for(int i=0;i<=n;i++)
		vis[i]=0;
	dfs(e1);
	return !(vis[e2]);
}
signed main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    cin>>n>>m;
    vector<pair<int,int>> ed; 
    for(int i=0;i<m;i++){
    	int a,b;
    	cin>>a>>b;
    	adj[a].push_back(b);
    	adj[b].push_back(a);
    	ed.push_back(make_pair(a,b));
    }
    for(auto e:ed)
    	if(check(e))
    		cout<<e.first<<' '<<e.second<<endl;
}

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