Submission #1109820

#	Time	Username	Problem	Language	Result	Execution time	Memory
1109820		SulA	Ice Hockey World Championship (CEOI15_bobek)	C++17	100 / 100	376 ms	10692 KiB

bobek

#include <bits/stdc++.h>
using namespace std;
 
signed main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr); cout.tie(nullptr);
 
    long long n; long long x; cin >> n >> x;
    long long a1[n/2], a2[(n+1)/2];
    for (auto& y : a1) cin >> y;
    for (auto& y : a2) cin >> y;
    vector<long long> half;
 
    for (long long mask = 0; mask < 1 << (n/2); mask++) {
        long long sum = 0;
        for (long long i = 0; i < n/2; i++) {
            if (mask & (1 << i)) {
                sum += a1[i];
            }
        }
        if (sum <= x) half.push_back(sum);
    }
    sort(half.begin(), half.end());
 
    long long cnt = 0;
    for (long long mask = 0; mask < (1 << ((n+1)/2)); mask++) {
        long long sum = 0;
        for (long long i = 0; i < (n+1)/2; i++) {
            if (mask & (1 << i)) {
                sum += a2[i];
            }
        }
        if (sum <= x) cnt += upper_bound(half.begin(), half.end(), x - sum) - half.begin();
    }
    cout << cnt;
}

• 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