266B - Queue at the School

#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <string>
#include <vector>
#include <queue>
#include <algorithm>
using namespace std;

int main() {

    int n, t;
    string str;
    cin >> n >> t;
    cin >> str;
    while(t--) {
        int i = 0;
        while(i < n) {
            if(i + 1 < n && str[i] == 'B' && str[i+1] == 'G') {
                swap(str[i], str[i+1]);
                i += 2;
            } else {
                ++i;
            }
        }
    }
    cout << str << endl;
    return 0;
}