Submission #870370

#	Time	Username	Problem	Language	Result	Execution time	Memory
870370		vjudge1	Ice Hockey World Championship (CEOI15_bobek)	C++17	100 / 100	428 ms	10664 KiB

bobek

#include <bits/stdc++.h>
#define int long long
using namespace std;
signed main()
{
    int n, m;
    cin >> n >> m;
    vector<int> a(n);
    for (int i = 0; i < n; i++)
        cin >> a[i];
    vector<int> sums;
    for (int i = 0; i < (1 << (n / 2)); i++)
    {
        int sum = 0;
        for (int j = 0; j < n / 2; j++)
            if ((1 << j) & i)
                sum += a[j];
        if (sum <= m)
            sums.push_back(sum);
    }
    sort(sums.begin(),sums.end());
    int sz = sums.size();
    int cnt = 0;

    for (int i = 0; i < (1 << (n - n / 2)); i++)
    {
        int sum = 0;
        for (int j = n/2; j < n; j++)
            if ((1 << (j-n/2)) & i)
                sum += a[j];
        int l = 0, r = sz-1;
        
        while (r-l > 1)
        {
            int mid = (r+l)/2;
            if (sums[mid] > m-sum)
                r = mid;
            else
                l = mid;
        }
        if (sums[r] <= m-sum)
            l = r;
        if (sums[l] <= m-sum)
        cnt+=l+1;
    }   
    cout << cnt << '\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