Submission #101693

#	Time	Username	Problem	Language	Result	Execution time	Memory
101693		lyc	Ice Hockey World Championship (CEOI15_bobek)	C++14	100 / 100	676 ms	8704 KiB

bobek

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

typedef long long ll;

int main() {
    //freopen("in.txt", "r", stdin);
    ios::sync_with_stdio(false);
    cin.tie(0);

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

    vector<ll> v;
    int s = n/2;
    for (int i = 0; i < (1<<s); ++i) {
        ll cur = 0;
        for (int j = 0; j < s; ++j) if (i & (1<<j)) cur += a[j];
        v.push_back(cur);
    }
    sort(v.begin(), v.end());

    ll ans = 0;
    for (int i = 0; i < (1<<(n-s)); ++i) {
        ll cur = 0;
        for (int j = s; j < n; ++j) if (i & (1<<(j-s))) cur += a[j];

        ll maxi = m - cur;
        ans += upper_bound(v.begin(), v.end(), maxi) - v.begin();
    }
    cout << ans << '\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