Submission #130712

#	Time	Username	Problem	Language	Result	Execution time	Memory
130712		nandonathaniel	Ice Hockey World Championship (CEOI15_bobek)	C++14	60 / 100	1090 ms	66040 KiB

bobek

#include<bits/stdc++.h>
using namespace std;
typedef long long LL;
const LL MOD=1000000007;

map<LL,LL> byk;
LL a[25],b[25];

int main(){
	ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
	LL n,m,ans=0;
	cin >> n >> m;
	LL first=n/2,second=n-first;
	for(LL i=0;i<first;i++)cin >> a[i];
	for(LL i=0;i<second;i++)cin >> b[i];
	for(LL i=0;i<(1<<first);i++){
		LL brp=0;
		for(LL j=0;j<first;j++){
			if(i & (1<<j))brp+=a[j];
		}
		byk[brp]++;
	}
	for(auto it=byk.begin();it!=byk.end();++it){
		if(it==byk.begin())continue;
		auto prev=it;
		--prev;
		byk[it->first]+=byk[prev->first];
	}
	for(LL i=0;i<(1<<second);i++){
		LL brp=0;
		for(LL j=0;j<second;j++){
			if(i & (1<<j))brp+=b[j];
		}
		//butuh maksimal m-brp
		auto butuh=byk.upper_bound(m-brp);
		if(butuh==byk.begin())continue;
		--butuh;
		ans+=(butuh->second);
	}
	cout << ans << endl;
	return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 0 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10