Submission #1218640

#	Time	Username	Problem	Language	Result	Execution time	Memory
1218640		takoshanava	Ice Hockey World Championship (CEOI15_bobek)	C++20	100 / 100	351 ms	8776 KiB

bobek

#include <bits/stdc++.h>
#define int long long
#define pb push_back
#define fs first
#define sc second
using namespace std;

signed main(){
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);

    int n, m;
    cin >> n >> m;
    int a[n];
    for(int i = 0; i < n; i++) cin >> a[i];
    int n1 = n/2, n2 = n - n/2;

    vector<int> sums1;
    for(int mask = 0; mask < (1 << n1); mask++){
        int s = 0;
        for(int i = 0; i < n1; i++){
            if (mask & (1 << i)) s += a[i];
        }
        if (s <= m) sums1.pb(s);
    }
    sort(sums1.begin(), sums1.end());

    int ans = 0;
    for(int mask = 0; mask < (1 << n2); mask++){
        int s2 = 0;
        for(int i = 0; i < n2; i++){
            if (mask & (1 << i)) s2 += a[n1 + i];
        }
        if (s2 > m) continue;
        int rem = m - s2;
        int cnt = upper_bound(sums1.begin(), sums1.end(), rem) - sums1.begin();
        ans += cnt;
    }

    cout << ans << endl;
}

• 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