Submission #748649

#	Time	Username	Problem	Language	Result	Execution time	Memory
748649		mariowong	Ice Hockey World Championship (CEOI15_bobek)	C++14	100 / 100	263 ms	20844 KiB

bobek

#include <bits/stdc++.h>
 
using namespace std;
 
long long n,m,a[55],ans;
vector <long long> v,v2;
bool vis[55]; 
void ex(int l,int r,long long sum){
	if (l > r){
		if (r == n)
		v2.push_back(sum);
		else
		v.push_back(sum);
	}
	else
	{
		if (sum+a[l] <= m){
			vis[l]=true;
			ex(l+1,r,sum+a[l]);
		}
		vis[l]=false;
		ex(l+1,r,sum);
	}
}
int main(){
	ios::sync_with_stdio(false);
//	freopen(".in","r",stdin);
//	freopen(".out","w",stdout);
	cin >> n >> m;
	for (int i=1;i<=n;i++){
		cin >> a[i];
	}
	ex(1,n/2,0); ex(n/2+1,n,0);
	sort(v.begin(),v.end());
	sort(v2.begin(),v2.end());
	for (int i=0;i<v.size();i++){
		ans+=lower_bound(v2.begin(),v2.end(),m-v[i]+1)-v2.begin();
	}
	cout << ans << "\n";
	return 0;
}

Compilation message (stderr)

bobek.cpp: In function 'int main()':
bobek.cpp:36:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |  for (int i=0;i<v.size();i++){
      |               ~^~~~~~~~~

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