제출 #208164

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
208164		SMani24	Ice Hockey World Championship (CEOI15_bobek)	C++11	10 / 100	6 ms	632 KiB

bobek

//In the name of Allah
//SMani24
#include<bits/stdc++.h>
#define debug(x) cerr << #x << " = " << x << endl
#define int long long
using namespace std;

const int N = 40;

int n, m, ans;
int a[N], dpu[N / 2], dpd[N / 2], prep[1 << (N / 2)];

void set_prep() {
    for (int i = 0; i < N / 2; i++)
        prep[1 << i] = i;
}

void read_input() {
    cin >> n >> m;
    for (int i = 0; i < n; i++)
        cin >> a[i];
}
void solve() {
    set_prep();
    int nu = n / 2, nd = (n + 1) / 2;
    for (int mask = 1; mask < (1 << nu); mask++)
        dpu[mask] = dpu[mask ^ (mask & -mask)] + a[prep[mask & -mask]];
    for (int mask = 1; mask < (1 << nd); mask++)
        dpd[mask] = dpd[mask ^ (mask & -mask)] + a[prep[mask & -mask] + nu];
    sort(dpu, dpu + (1 << nu));
    sort(dpd, dpd + (1 << nd));
    for (int i = 0; i < (1 << nu); i++) {
        if (dpu[i] > m)
            break;
        ans += upper_bound(dpd, dpd + (1 << nd), m - dpu[i]) - dpd;
    }
}
void write_output() {
    cout << ans << endl;
}

int32_t main() {
    ios :: sync_with_stdio(0), cin.tie(0), cout.tie(0);
    read_input(), solve(), write_output();
    return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10