Submission #189099

#	Time	Username	Problem	Language	Result	Execution time	Memory
189099		MvC	Tug of War (BOI15_tug)	C++11	18 / 100	22 ms	632 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=1e5+50;
const int mod=1e9+7;
using namespace std;
int n,k,l[50],r[50],s[50],ba,bb,sa,sb,i,j;
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=0;i<2*n;i++)cin>>l[i]>>r[i]>>s[i],l[i]--,r[i]--;
	for(i=0;i<(1<<(2*n));i++)
	{
		if(__builtin_popcount(i)!=n)continue;
		ba=bb=sa=sb=0;
		for(j=0;j<2*n;j++)
		{
			if(i&(1<<j))ba|=(1<<l[j]),sa+=s[j];
			else bb|=(1<<r[j]),sb+=s[j];
		}
		if(bb==(1<<n)-1 && bb==ba && abs(sa-sb)<=k)rc("YES");
	}
	cout<<"NO"<<endl;
	return 0;
}

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