Monistus

input/code.cpp: In function 'void recurse(std::string&, int, int)':
input/code.cpp:28:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |     if (i >= str.length()) {
      |         ~~^~~~~~~~~~~~~~~

#include <iostream>
#include <ostream>
#include <string>

void recurse(std::string& str, int n, int len) {
    int i = n;

    int max = str.length();

    if (len > 0) {
        max = n+len;
    }

    while (i < max) {
        if (str[i] >= '1' && str[i] <= '9') {
            int c = int(str[i]) - 48;
            if (len > 0 && i == max-1) {
                recurse(str, n, c);
            } else {
                recurse(str, i+1, c);
            }
        } else {
            std::cout << str[i] << std::flush;
        }
        i++;
    }

    if (i >= str.length()) {
        return;
    }

    return;
}

int main() {
    std::string input;
    std::cin >> input;

    recurse(input, 0, 0);

    std::cout << "\n";

    return 0;
}

Test 1

Group: 1, 2

Verdict: ACCEPTED

Test 2

Group: 1, 2

Verdict: ACCEPTED

Test 3

Group: 1, 2

Verdict: WRONG ANSWER

Test 4

Group: 1, 2

Verdict: ACCEPTED

Test 5

Group: 1, 2

Verdict: WRONG ANSWER

Test 6

Group: 1, 2

Verdict: WRONG ANSWER

Test 7

Group: 1, 2

Verdict: WRONG ANSWER

Test 8

Group: 2

Verdict: ACCEPTED

Test 9

Group: 2

Verdict: WRONG ANSWER

Test 10

Group: 2

Verdict: WRONG ANSWER

Test 11

Group: 2

Verdict: ACCEPTED

Test 12

Group: 2

Verdict: ACCEPTED

Test 13

Group: 2

Verdict: ACCEPTED

Test 14

Group: 2

Verdict: ACCEPTED