Submission #445912

#	Time	Username	Problem	Language	Result	Execution time	Memory
445912		snasibov05	Ice Hockey World Championship (CEOI15_bobek)	C++14	100 / 100	486 ms	8620 KiB

bobek

#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

#define ll long long
#define pb push_back

int main() {
    int n; ll m; cin >> n >> m;
    vector<ll> v(n);
    for (int i = 0; i < n; ++i) {
        cin >> v[i];
    }

    int mid = (n-1) / 2;
    vector<ll> p1;
    for (int i = 0; i < (1 << (mid+1)); ++i) {
        ll sum = 0;
        int x = i;
        for (int j = 0; j <= mid; ++j) {
            if (x % 2 == 1) sum += v[j];
            x /= 2;
        }
        if (sum <= m) p1.pb(sum);
    }

    sort(p1.begin(), p1.end());

    ll ans = 0;
    for (int i = 0; i < (1 << (n - mid - 1)); ++i) {
        ll sum = 0;
        int x = i;
        for (int j = mid + 1; j < n; ++j) {
            if (x % 2 == 1) sum += v[j];
            x /= 2;
        }
        if (sum > m) continue;
        int k = upper_bound(p1.begin(), p1.end(), m - sum) - p1.begin();
        ans += 1ll * k;
    }

    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