Submission #1028260

#	Time	Username	Problem	Language	Result	Execution time	Memory
1028260		lmao123456	Ice Hockey World Championship (CEOI15_bobek)	C++14	100 / 100	221 ms	20916 KiB

bobek

#include <bits/stdc++.h>
using namespace std;
#define int long long
vector<int> df(vector<int> v) {
    int n = v.size();
    vector<int> res;
    for(int mask = 0; mask < (1 << n); mask++) {
        int sum = 0;
        for(int i = 0; i < n; i++) {
            sum += ((mask >> 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 as = n / 2;
    int bs = n - as;
    vector<int> a = v;
    a.resize(as);
    vector<int> b = v;
    reverse(b.begin(), b.end());
    b.resize(bs);
    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:47:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   47 |         while(idx < y.size() && cur + y[idx] > m) {
      |               ~~~~^~~~~~~~~~

• 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