So I was debugging this code and managed input/outputs in separate files. I ran the same code with same flags in codeblocks and WSL ubuntu 18.04, they gave me two different outputs.

My Code

#include<bits/stdc++.h>

using namespace std;

int main() {
#ifdef ROBIN
    freopen("in", "r", stdin);
    freopen("out", "w", stdout);
#endif // ROBIN
    int t, d = 0;
    cin >> t;
    getchar();
    while (t--) {
        string ss, tt;
        getline(cin, ss);
        getline(cin, tt);
        cout << "SS: " << ss << endl;
        cout << "TT: " << tt << endl;
    }
}

Input

3
Tom Marvolo Riddle
I am Lord Voldemort
I am not Harry Potter
Hi Pretty Roar to man
Harry and Voldemort
Tom and Jerry and Harry

Output (Code::Blocks)

SS: Tom Marvolo Riddle
TT: I am Lord Voldemort
SS: I am not Harry Potter
TT: Hi Pretty Roar to man
SS: Harry and Voldemort
TT: Tom and Jerry and Harry

Output (WSL)

SS: 
TT: Tom Marvolo Riddle
SS: I am Lord Voldemort
TT: I am not Harry Potter
SS: Hi Pretty Roar to man
TT: Harry and Voldemort

I would appreciate it if someone gives me a proper explanation of this. Thanks.
Flags:
-DROBIN
-std=c++14
-O2