제출 #580251

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
580251		MODDI	Pipes (CEOI15_pipes)	C++14	10 / 100	1866 ms	65536 KiB

pipes

#include <bits/stdc++.h>
#define ll long long
#define pii pair<int,int>
#define pll pair<ll,ll>
#define vi vector<int>
#define vl vector<ll>
#define mp make_pair
#define pb push_back
using namespace std;
int n, m;
vector<int> G[100100];

vector<bool> visited;
vector<int> tin, low;
int timer;
void IS_BRIDGE(int a, int b){
	cout<<a+1<<" "<<b+1<<endl;
}
void dfs(int v, int p = -1) {
    visited[v] = true;
    tin[v] = low[v] = timer++;
    for (int to : G[v]) {
        if (to == p) continue;
        if (visited[to]) {
            low[v] = min(low[v], tin[to]);
        } else {
            dfs(to, v);
            low[v] = min(low[v], low[to]);
            if (low[to] > tin[v])
                IS_BRIDGE(v, to);
        }
    }
}
void init() {
    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);
    }
}
int main(){	
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	cin>>n>>m;
	for(int i = 0; i < m; i++){
		int a, b;
		cin>>a>>b;
		a--; b--;
		G[a].pb(b);
		G[b].pb(a);
	}
	init();
}

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• Subtask 3: 10 / 10
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