Getting wrong answer even tho logic seems to be same

help
1

My code looks like it has the same logic as one of the submission which got all test cases approved. here’s the submitted code i am talking about
working code link
am i missing something here? please help me figure it out

my code:

#include <bits/stdc++.h>
using namespace std;

int main() {
    int t;cin>>t;
    while(t--)
    {
        int n, req_wins, rem, index = 0;
        string s, ans;
        
        cin>>n;
        cin>>s;
        
        req_wins = n/2 + 1;
        rem = n;
        while(req_wins < rem && req_wins)
        {
            ans += "P";
            if(s[n-rem] == 'R')
                req_wins--;
            rem--;
        }
        while(req_wins)
        {
            switch(s[n-rem])
            {
                case 'R':
                    ans += "P";
                    break;
                case 'P':
                    ans += "S";
                    break;
                case 'S':
                    ans += "R";
                    break;
            }
            
            rem--;
            req_wins--;
        }
        

        cout<<ans<<endl;
    }
}