Järjestys

#include <iostream>
#include <algorithm>

using namespace std;

int main()
{
    int n;
    cin >> n;

    for (int i = 0; i < n; i++)
    {
        string x;
        cin >> x;

        int At = 0;
        for (char c : x)
            if (c == 'A')
                At++;

        int tulos = 0;

        for (int j = 0; j < At; j++)
            if (x.at(j) == 'B')
                tulos++;

        cout << tulos << "\n";
    }
}

Test 1

Verdict: ACCEPTED