Monistus

use std::io::stdin;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let mut merkkijono = stdin().lines().next().unwrap()?;
    while let Some(numero_idx) = merkkijono.find([
        '1','2','3','4','5','6','7','8','9'
    ]) {
        let numero = merkkijono.chars().nth(numero_idx).unwrap();
        let numero = numero.to_digit(10).unwrap() as usize;
        let mut chars =  merkkijono.chars();
        let ennen: String = chars.by_ref().take(numero_idx).collect();
        chars.by_ref().next(); // skip numero
        let tupla: String = chars.by_ref().take(numero).collect();
        let loput: String = chars.by_ref().collect();
        //println!("loop: {numero_idx} {numero} {ennen}-{tupla}-{loput}");
        merkkijono = String::new();
        merkkijono.push_str(&ennen);
        merkkijono.push_str(&tupla);
        merkkijono.push_str(&tupla);
        merkkijono.push_str(&loput);
        //println!("loop: {merkkijono}");
    }
    // 500 000
    println!("{merkkijono}");
    Ok(())
}

Test 1

Group: 1, 2

Verdict: ACCEPTED

Test 2

Group: 1, 2

Verdict: ACCEPTED

Test 3

Group: 1, 2

Verdict: ACCEPTED

Test 4

Group: 1, 2

Verdict: ACCEPTED

Test 5

Group: 1, 2

Verdict: ACCEPTED

Test 6

Group: 1, 2

Verdict: ACCEPTED

Test 7

Group: 1, 2

Verdict: ACCEPTED

Test 8

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 9

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 10

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 11

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 12

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 13

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 14

Group: 2

Verdict: TIME LIMIT EXCEEDED