微众银行笔试第三题

#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

int main()
{
    int n, u, v;
    cin >> n >> u >> v;
    vector<int> a(n + 1);
    vector<int> presum(n + 1);
    presum[0] = 0;
    a[0] = 0;
    for (int i = 1; i <= n; i++)
    {
        cin >> a[i];
        presum[i] = presum[i - 1] + a[i];
    }
  
    int count = 0;
    for (int i = 1; i <= n; i++)
    {
        for (int j = i; j <= n; j++)
        {
            int sum = presum[j] - presum[i - 1];
            if ((sum / (j - i + 1)) == u / v)
                count += 1;
        }
    }
    cout << count;
    return 0;
}

有没有大佬帮我看下为啥一个用例都过不了