제출 #224074

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
224074		kshitij_sodani	Pipes (CEOI15_pipes)	C++17	0 / 100	1454 ms	30456 KiB

pipes

#include <iostream>
#include <bits/stdc++.h>
using namespace std;
#define a first
#define b second
#define pb push_back
int n,m;
int par[100001];
int par2[100001];
int find(int no){
	if(par[no]==no){
		return no;
	}
	par[no]=find(par[no]);
	return par[no];
}
int find2(int no){
	if(par2[no]==no){
		return no;
	}
	par2[no]=find2(par2[no]);
	return par2[no];
}
vector<int> adj[100001];
vector<pair<int,int>> ans;
int cco=1;
void dfs(int no,int par3=-1){
	par[no]=cco;
	cco+=1;
	int co=0;
//	cout<<no<<endl;
	vector<int> kk;
	for(auto nn:adj[no]){
		if(par[nn]>0){

		//	cout<<no<<",:<:"<<nn<<endl;
			if(nn==par3 or par[nn]>=par[no]){
				continue;
			}
	//		cout<<no<<",:<:"<<nn<<endl;
			par2[nn]-=1;
			co+=1;
		}
		else{
			int xx=par2[no];
			dfs(nn,no);
			if(par2[nn]==0){
				cout<<no+1<<" "<<nn+1<<endl;

			}
			kk.pb(nn);

		/*	if(par2[nn]+par2[no]==0){
				cout<<no+1<<"::"<<nn+1<<endl;
			}*/
		}
	}
	//cout<<no<<",..,"<<par2[no]<<endl;
/*	for(auto nn:kk){
		if(par2[nn]+par2[no]==0){
			cout<<no+1<<"::"<<nn+1<<endl;
		}

	}*/
	for(auto nn:kk){
		par2[no]+=par2[nn];
	}
	
	par2[no]+=co;
//	cout<<no<<",,"<<par2[no]<<endl;
}
int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cin>>n>>m;
	for(int i=0;i<n;i++){
		par[i]=i;
		par2[i]=i;
	}
	int aa,bb;
	int cc,dd;
	int e,f;
	for(int i=0;i<m;i++){
		cin>>cc>>dd;
		cc-=1;
		dd-=1;
		//cout<<cc<<" "<<dd<<endl;
		aa=find(cc);
	//	cout<<aa;
		bb=find(dd);
	//	cout<<"::"<<bb<<endl;
		if(aa==bb){
			e=find2(cc);
			f=find2(dd);
			if(e==f){
				continue;
			}
			adj[cc].pb(dd);
			adj[dd].pb(cc);
			par2[e]=f;
		}
		else{
			par[aa]=bb;
			adj[cc].pb(dd);
			adj[dd].pb(cc);
		}
	//	cout<<cc<<",,,,,,,,"<<dd<<endl;
	}
	//vis=par
	//dp=par2
	for(int i=0;i<n;i++){
		par[i]=0;
		par2[i]=0;
	}
	for(int i=0;i<n;i++){
		if(par[i]==0){
			dfs(i);
		}
	}
	return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

pipes.cpp: In function 'void dfs(int, int)':
pipes.cpp:45:8: warning: unused variable 'xx' [-Wunused-variable]
    int xx=par2[no];
        ^~

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