Monistus

/*
    C++ code author: Vludo
    Created: 2023-11-05 21:41:55
*/
#include <bits/stdc++.h>

#define forn(i, n) for(int i=0; i<n; i++)
#define FOR(i, j, n) for(int i=j; i<n; i++)
#define pb push_back
#define F first
#define S second
#define ever ;;

typedef long long ll;

const int inf = 1.01e9;
const int mod = 1e9 + 7;

using namespace std;

char s[(int)1e6+10];
char t[(int)5e5+10];

int main () {
	ios_base::sync_with_stdio(0);
	cin.tie(0); cout.tie(0);
	
	cin >> s;
	
	int n = strlen(s);
	
	reverse(s, s+n);
	
	int pos = n-1;
	int posT = 0;
	
	while (pos >= 0) {
		int num = s[pos]-'0';
		if (num >= 0 && num <= 9) {
			forn(i, num) {
				s[pos+num-i-1] = s[pos-i-1];
			}
			pos += num-1;
			continue;
		}
		t[posT] = s[pos];
		posT++; pos--;
	}
	
	cout << t << endl;
	
	return 0;
}

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: ACCEPTED

Test 9

Group: 2

Verdict: ACCEPTED

Test 10

Group: 2

Verdict: ACCEPTED

Test 11

Group: 2

Verdict: ACCEPTED

Test 12

Group: 2

Verdict: ACCEPTED

Test 13

Group: 2

Verdict: ACCEPTED

Test 14

Group: 2

Verdict: ACCEPTED