How I start solving a problem in C++

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My Start Code

#inclsude <iostream>
#include <fstream>
#include <vector>

using namespace std;

#define cin input
#define cout output

ifstream input("D:/CP/input.txt");
ofstream output("D:/CP/output.txt");

void solve()
{
    
}

int main() {
    int t = 1; //cin >> t;
    while (t--) solve();

    input.close();
    output.close();

    return 0;
}

Let's say I write some code in the "solve" function. I check the example tests and if they pass, I submit BUT I comment the #define cin input and the #define cout output so the code can work WITHOUT text files

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