80分求助 WA#7 #9

求调

#include<iostream>
#include<cstring>
#include<string>
using namespace std;

const int N = 1e5 + 10;
long long i, n, m, cnta, cntb, pos[N];
string a, b;

int main()
{
    cin >> n >> m;
    cin >> a >> b;
    for (i = 0; i < n; i++) {
        if (a[i] == '#') {
            pos[cnta] = i;
            cnta++;
        }
        if (b[i] == '#') {
            cntb++;
        }
    }
    if (cnta == 0) {
        cout << a << endl;
        return 0;
    }
    long long cnt = 0;
    for (i = 0; i < m; i++) {
        if (cntb < 25 || i % 26 == 0) {
            a[pos[cnt]] = char(i % 26 + 'a');
            cnt++;
            if (cnt == cnta)
                break;
        }
        else {
            cntb -= 25;
            i += 24;
        }
    }
    cout << a << endl;

    return 0;
}