제출 #189104

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
189104		MvC	Tug of War (BOI15_tug)	C++11	23 / 100	17 ms	2808 KiB

tug

#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#include <bits/stdc++.h>
#define rc(x) return cout<<x<<endl,0
#define pb push_back
#define mkp make_pair
#define in insert
#define er erase
#define fd find
#define fr first
#define sc second
typedef long long ll;
typedef long double ld;
const ll INF=0x3f3f3f3f3f3f3f3f;
const ll llinf=(1LL<<62);
const int inf=(1<<30);
const int nmax=6e4+50;
const int mod=1e9+7;
using namespace std;
int n,k,l[nmax],r[nmax],s[nmax],i,vl[nmax];
vector<int>g[nmax];
bitset<nmax>b;
int dfs(int x)
{
	for(int i=0;i<(int)g[x].size();i++)
	{
		int y=g[x][i];
		if(b[y])continue;
		b[y]=1;
		if(!vl[y] || dfs(vl[y]))
		{
			vl[y]=x;
			return 1;
		}
	}
	return 0;
}
int main()
{
	//freopen("sol.in","r",stdin);
	//freopen("sol.out","w",stdout);
	//mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
	ios_base::sync_with_stdio(false);cin.tie(0);cerr.tie(0);cout.tie(0);
	cin>>n>>k;
	for(i=1;i<=2*n;i++)
	{
		cin>>l[i]>>r[i]>>s[i];
		g[i].pb(l[i]);
		g[i].pb(r[i]+n);
	}
	for(i=1;i<=2*n;i++)
	{
		b.reset();
		if(!dfs(i))rc("NO");
	}
	cout<<"YES"<<endl;
	return 0;
}

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