Submission #1070341

#	Time	Username	Problem	Language	Result	Execution time	Memory
1070341		AdamGS	Tug of War (BOI15_tug)	C++17	23 / 100	11 ms	2908 KiB

tug

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(a, b) for(int a = 0; a < (b); ++a)
#define st first
#define nd second
#define pb push_back
#define all(a) a.begin(), a.end()
const int LIM=3e4+7;
vector<pair<int,int>>V[2*LIM];
int F[2*LIM], ile[2*LIM], n;
int fnd(int x) {
	if(F[x]==x) return x;
	return F[x]=fnd(F[x]);
}
void uni(int a, int b) {
	a=fnd(a); b=fnd(b);
	if(a!=b) {
		ile[a]+=ile[b];
		F[b]=a;
	}
	--ile[a];
}
int main() {
	ios_base::sync_with_stdio(0); cin.tie(0);
	int k;
	cin >> n >> k;
	rep(i, 2*n) {
		F[i]=i;
		ile[i]=1;
	}
	rep(i, 2*n) {
		int a, b, c;
		cin >> a >> b >> c; --a; --b; b+=n;
		V[a].pb({b, c});
		V[b].pb({a, c});
		uni(a, b);
	}
	rep(i, 2*n) if(ile[fnd(i)]<0) {
		cout << "NO\n";
		return 0;
	}
	cout << "YES\n";
}

• Subtask 1: 0 / 18
• Subtask 2: 0 / 30
• Subtask 3: 23 / 23
• Subtask 4: 0 / 29