Monistus

input/code.cpp: In function 'int main()':
input/code.cpp:18:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   18 |     for (int i = 0; i < s.size(); i++) {
      |                     ~~^~~~~~~~~~
input/code.cpp:50:13: warning: unused variable 'c' [-Wunused-variable]
   50 |         int c = fi[i] - '0';
      |             ^

#include <iostream>
#include <vector>
#include <stack>
#include <algorithm>

using namespace std;

bool if_num(int c) {
    if (0 <= c && c < 9) {
        return true;
    }
    return false;
}

int main() {
    string s; cin >> s;
    vector<char> a(s.size());
    for (int i = 0; i < s.size(); i++) {
        a[i] = (char) s[i];
    }

    int n = a.size();
    vector<char> fi;
    for (int i = n - 1; i >= 0; i--) {
        int c = a[i] - '0';
        if (!if_num(c)) {
            fi.push_back(a[i]);
            continue;
        }
        for (int j = i + c; j > i; j--) {
            fi.push_back(a[j]);
        }
    }
    reverse(fi.begin(), fi.end());
    n = fi.size();

    vector<char> fifi;
    for (int i = n - 1; i >= 0; i--) {
        int c = fi[i] - '0';
        if (!if_num(c)) {
            fifi.push_back(fi[i]);
            continue;
        }
        for (int j = i + c; j > i; j--) {
            fifi.push_back(fi[j]);
        }
    }

    for (int i = fifi.size() - 1; i >= 0; i--) {
        int c = fi[i] - '0';
        //if (if_num(c)) continue;
        cout << fifi[i];
    }
}

Test 1

Group: 1, 2

Verdict: WRONG ANSWER

Test 2

Group: 1, 2

Verdict: ACCEPTED

Test 3

Group: 1, 2

Verdict: WRONG ANSWER

Test 4

Group: 1, 2

Verdict: WRONG ANSWER

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: WRONG ANSWER

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: WRONG ANSWER

Test 13

Group: 2

Verdict: WRONG ANSWER

Test 14

Group: 2

Verdict: WRONG ANSWER