Pakkaus

// Don't judge
#include <bits/stdc++.h>
using namespace std;


int main() {

    string s;
    cin >> s;

    string len = "";
    string temp = "";

    for(char c : s) {
        if(c >= '0' && c <= '9') {
            if(temp != "") {

                for(int i = 0; i < stoi(len); i++)
                    cout << temp;    
                
                temp = "";    
                len = "";
            }
            len = len + c;
        } else temp = temp + c;    
    }

    for(int i = 0; i < stoi(len); i++)
        cout << temp;    

    return 0;    
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 1

Verdict: ACCEPTED

Test 3

Group: 1

Verdict: ACCEPTED

Test 4

Group: 1

Verdict: ACCEPTED

Test 5

Group: 1

Verdict: ACCEPTED

Test 6

Group: 2

Verdict: ACCEPTED

Test 7

Group: 2

Verdict: ACCEPTED

Test 8

Group: 2

Verdict: ACCEPTED

Test 9

Group: 2

Verdict: ACCEPTED

Test 10

Group: 2

Verdict: ACCEPTED

Test 11

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 12

Group: 3

Verdict: ACCEPTED

Test 13

Group: 3

Verdict: ACCEPTED

Test 14

Group: 3

Verdict: ACCEPTED

Test 15

Group: 3

Verdict: ACCEPTED