HIIT Generation

#include <iostream>
 
using namespace std;
 
int len;
char rep[1000000];
 
void write(char letter,int s) {
//cout << "wr\n";
    int a = 0;
    for (int i = s; i < len; i++) {
        if (letter == rep[i]) {
            write('H', i + 1);
            write('I', i + 1);
            write('I', i + 1);
            write('T', i + 1);
            a = 1;
            break;
        }
    }
    if (a == 0)
    cout << letter;
}
 
int main() {
    cin >> len;
    char a;
    for (int i = 0; i < len; i++) {
        cin >> a;
        rep[i] = a;
    }
    //cout << rep[0] << " " << rep[1] << "\n";
    write('H', 0);
    write('I', 0);
    write('I', 0);
    write('T', 0);
 
    cout << endl;
 
    return 0;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: TIME LIMIT EXCEEDED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED