Submission #1028251

#	Time	Username	Problem	Language	Result	Execution time	Memory
1028251		lmao123456	Ice Hockey World Championship (CEOI15_bobek)	C++14	20 / 100	61 ms	10476 KiB

bobek

#include <bits/stdc++.h>
using namespace std;
vector<int> df(vector<int> v) {
    int n = v.size();
    vector<int> res;
    for(int j = 0; j < (1 << n); j++) {
        int sum = 0;
        for(int i = 0; i < n; i++) {
            sum += ((j >> i) & 1) * v[i];
        }
        res.push_back(sum);
    }
    sort(res.begin(), res.end());
    return res;
}

void solve() {
    int n, m;
    cin >> n >> m;
    vector<int> v(n);
    for(int i = 0; i < n; i++) {
        cin >> v[i];
    }
    if(n == 1) {
        if(v[0] <= m) {
            cout << "2" << "\n";
        } else {
            cout << "1" << "\n";
        }
        return;
    }
    int a1 = n / 2;
    int b1 = n - a1;
    vector<int> a = v;
    a.resize(a1);
    vector<int> b = v;
    reverse(b.begin(), b.end());
    b.resize(b1);
    reverse(b.begin(), b.end());
    vector<int> x = df(a);
    vector<int> y = df(b);
    reverse(y.begin(), y.end());
    int ans = 0;
    int idx = 0;
    for(int cur : x) {
        while(idx < y.size() && cur + y[idx] > m) {
            idx++;
        }
        ans += y.size() - idx;
    }
    cout << ans << "\n";
}

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    solve();
}

Compilation message (stderr)

bobek.cpp: In function 'void solve()':
bobek.cpp:46:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   46 |         while(idx < y.size() && cur + y[idx] > m) {
      |               ~~~~^~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 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