제출 #874354

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
874354		AHOKA	Pipes (CEOI15_pipes)	C++14	0 / 100	2400 ms	65536 KiB

pipes

#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2")

#include <bits/stdc++.h> 

using namespace std;

#define threesum cin.tie(NULL); cout.tie(NULL); ios_base::sync_with_stdio(false);
#define all(a) a.begin(), a.end()
#define lmx 9223372036854775807;
//#define mod 1000000007
#define F first
#define S second

vector<int> adj[100010];
int par[100010], par2[100010], sz[100010], n, m, mxsz, cnt, seen[100010], d[100010];

int getpar(int v){
    return ((par[v]!=v) ? par[v] = getpar(par[v]) : v);
}

int getpar2(int v){
    return ((par2[v]!=v) ? par2[v] = getpar2(par2[v]) : v);
}

bool merge(int u, int v){
    int u1 = getpar(u), v1 = getpar(v);
    if(u1 == v1){
		int u2 = getpar2(u), v2 = getpar2(v);
    	if(u2 == v2) return 0;
		par2[u2] = v2;
		return 1;
	}
	par[u1] = v1;
	return 1;
}

void dfs(int v, int p){
	seen[v]=seen[p]+1;
	d[v]=seen[v];
	for(auto u:adj[v]){
		if(u==p)continue;
		if(!seen[u])dfs(u, v);
		d[v]=min(d[v], d[u]);
	}
	if(d[v]==seen[v]&&p!=0)cout << v << " " << p << "\n";
}

int main() {
	cin >> n >> m;
	for(int i=1;i<=n;i++)par[i]=i, par2[i]=i;
	for(int i=0;i<m;i++){
		int u, v;cin >> v >> u;
		if(merge(u, v))adj[v].push_back(u), adj[u].push_back(v);
	}
	for(int i=1;i<=n;i++)dfs(i, 0);
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 10
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• Subtask 10: 0 / 10