제출 #1021702

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1021702		idiotcomputer	Pipes (CEOI15_pipes)	C++11	0 / 100	674 ms	5528 KiB

pipes

#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2")
#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define sz size 
 
const int mxN = 1e5;
int n,m;

int p[2*mxN];

int gpar(const int &c){
	if (p[c] == c) return c;
	p[c] = gpar(p[c]);
	return p[c];
}

bool ss(const int &a, const int &b){
	return gpar(a) == gpar(b);
}

void un(const int &a, const int &b){
	p[gpar(a)] = gpar(b);
}

int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
 
	cin >> n >> m;
	for (int i = 0; i < 2*n; i++) p[i] = i; 
	int a,b;
	int cnt = 0;
	for (int i = 0; i < m; i++){
		cin >> a >> b;
		a -= 1;
		b -= 1;
		if (!ss(a,b)) un(a,b);
		else if (!ss(a+n,b+n)) un(a+n,b+n);
		else continue;
		cnt++;
	}
	if (cnt > 2*n-2) while(true) continue;
	cout << cnt << '\n';
	return 0;	
}
 

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