Submission #958923

#	Time	Username	Problem	Language	Result	Execution time	Memory
958923		Ghetto	Ice Hockey World Championship (CEOI15_bobek)	C++17	100 / 100	419 ms	10428 KiB

bobek

#include <bits/stdc++.h>
using namespace std;
using lint = long long;
const int MAX_N = 40 + 2;

int n;
lint m;
lint c[MAX_N];

void solve_edge() {
    if (n != 1) return;
    lint ans = 1 + (bool) (c[1] <= m);
    cout << ans << '\n';
    exit(0);
}

int size1, size2;
vector<lint> ord_costs;
void precomp() {
    size1 = n / 2;
    size2 = n - n / 2;

    for (int mask = 0; mask < (1 << size2); mask++) {
        lint cost = 0;
        for (int b = 0; b < size2; b++) {
            if (!(mask & (1 << b))) continue;
            cost += c[n / 2 + 1 + b];
        }
        ord_costs.push_back(cost);
    }
    sort(ord_costs.begin(), ord_costs.end());
}

int main() {
    // freopen("ice.in", "r", stdin);

    cin >> n >> m;
    for (int i = 1; i <= n; i++) cin >> c[i];

    solve_edge();
    precomp();

    lint ans = 0;
    for (int mask = 0; mask < (1 << size1); mask++) {
        lint cost = 0;
        for (int b = 0; b < size1; b++) {
            if (!(mask & (1 << b))) continue;
            cost += c[1 + b];
        }

        lint tar_cost = m - cost;
        lint tar_ind = upper_bound(ord_costs.begin(), ord_costs.end(), tar_cost) - ord_costs.begin();
        ans += tar_ind;
    }
    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