Submission #40670

#	Time	Username	Problem	Language	Result	Execution time	Memory
40670		MatheusLealV	Ice Hockey World Championship (CEOI15_bobek)	C++14	100 / 100	619 ms	17596 KiB

bobek

#include <bits/stdc++.h>
#define N 41
using namespace std;
typedef long long ll;

ll n, v[N], ans, k;

vector<ll> val;

int main()
{
	ios::sync_with_stdio(false); cin.tie(0);

	cin>>n>>k;

	for(int i = 0; i < n; i++) cin>>v[i];

    int m = n/2;

    for(int mask = 1; mask <= ( (1<<(m + 1)) - 1) ; mask ++)
    {
        ll sum = 0;

        for(int i = 0; i <= m; i++)
        {
            if( (mask & (1<<i)) )
            {
                sum += v[i];
            }
        }

        if(sum <= k) ans ++;

        val.push_back(sum);
    }

    sort(val.begin(), val.end());

    for(int mask = 1; mask <= ( (1<<(n - m - 1)) - 1) ; mask ++)
    {
    	ll sum = 0;

        for(int i = m + 1; i < n; i++)
        {
            int j = i - m - 1;

        	if( (mask & (1<<j)) )
        	{
        		sum += v[i];
        	}
        }

       if(sum <= k)
       {
       		//cout<<sum<<" "<< (upper_bound(val.begin(), val.end(), k - sum) - val.begin())<<"\n";
       		ans += upper_bound(val.begin(), val.end(), k - sum) - val.begin() + 1;
       }
    }

    cout<<ans + 1<<"\n";
}

• 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