Queue at the School Codeforces Round #163 (Div. 2)

#include<bits/stdc++.h>
using namespace std;
int main()
{
	int t,n;
	cin >> n >> t;
	string s;
	cin >> s;
	for(int i=0;i<t;i++)
	{
		for(int j=0;j<n-1;)
		{
			if(s[j]=='B'&&s[j+1]=='G')
			{swap(s[j],s[j+1]);j+=2;}
			else
			j++;
		}
	}
	cout << s << endl;
}