Submission #883288

#	Time	Username	Problem	Language	Result	Execution time	Memory
883288		votranngocvy	Ice Hockey World Championship (CEOI15_bobek)	C++14	100 / 100	288 ms	9676 KiB

bobek

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

#define int long long
vector<int>vec;
int a[50],n,m,ans;

void calcLeft(int i,int sum) {
    if (i > n / 2) {
        if (sum <= m) vec.push_back(sum);
        return;
    }
    calcLeft(i + 1,sum);
    calcLeft(i + 1,sum + a[i]);
}

int tknp(int l,int r,int x) {
    int ans = 0;
    while (l <= r) {
        int mid = (l + r) / 2;
        if (vec[mid] <= x) ans = max(ans,mid + 1),l = mid + 1;
        else r = mid - 1;
    }
    return ans;
}

void calcRight(int i,int sum) {
    if (i > n) {
        if (sum <= m) ans += tknp(0,vec.size() - 1,m - sum);
        return;
    }
    calcRight(i + 1,sum);
    calcRight(i + 1,sum + a[i]);
}

signed main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    cin >> n >> m;
    for (int i = 1; i <= n; i++) cin >> a[i];
    calcLeft(1,0);
    sort(vec.begin(),vec.end());
    calcRight(n / 2 + 1,0);
    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