Submission #1298250

#	Time	Username	Problem	Language	Result	Execution time	Memory
1298250		kawhiet	Ice Hockey World Championship (CEOI15_bobek)	C++20	100 / 100	328 ms	20812 KiB

bobek

#include <bits/stdc++.h>
using namespace std;

#define int long long

vector<int> get(vector<int> a) {
    int n = a.size();
    vector<int> ret;
    for (int s = 0; s < (1 << n); s++) {
        int sum = 0;
        for (int i = 0; i < n; i++) {
            if (s & (1 << i)) {
                sum += a[i];
            }
        }
        ret.push_back(sum);
    }
    sort(ret.begin(), ret.end());
    return ret;
}

signed main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int n, m;
    cin >> n >> m;
    vector<int> a, b;
    for (int i = 0; i < n; i++) {
        int x;
        cin >> x;
        if (i < n / 2) {
            a.push_back(x);
        } else {
            b.push_back(x);
        }
    }
    vector<int> k = get(a), t = get(b);
    int ans = 0;
    for (auto x : t) {
        ans += upper_bound(k.begin(), k.end(), m - x) - k.begin();
    }
    cout << ans << '\n';
    return 0;
}

• 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