Submission #967721

#	Time	Username	Problem	Language	Result	Execution time	Memory
967721		jadai007	Ice Hockey World Championship (CEOI15_bobek)	C++14	0 / 100	293 ms	22432 KiB

bobek

#include<bits/stdc++.h>
#define int long long

using namespace std;

vector<int> lefts, rights;
int arr[50], n, k, idx, ans;

void solve(int l, int r){
    for(int i = 0; i < (1<<(r - l + 1)); ++i){
        int sum = 0;
        for(int j = l; j <= r; ++j) if(i&(1<<(j - l + 1))) sum += arr[j];
        if(l == 1) lefts.push_back(sum);
        else rights.push_back(sum);
    }
}

signed main(){
    cin.tie(nullptr)->sync_with_stdio(false);
    cin >> n >> k;
    for(int i = 1; i <= n; ++i) cin >> arr[i];
    if(n == 1){
        if(arr[1] <= k) cout << 1;
        else cout << 0;
        return 0;
    }
    solve(1, n / 2);
    solve(n / 2 + 1, n);
    sort(lefts.begin(), lefts.end());  sort(rights.begin(), rights.end());
    reverse(lefts.begin(), lefts.end());
    for(auto x:lefts){
        while(idx < rights.size() && rights[idx] + x <= k) idx++;
        ans+=idx;
    }
    cout << ans;
    return 0;
}

Compilation message (stderr)

bobek.cpp: In function 'int main()':
bobek.cpp:32:19: 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]
   32 |         while(idx < rights.size() && rights[idx] + x <= k) idx++;
      |               ~~~~^~~~~~~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 10
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• Subtask 10: 0 / 10