Pakkaus

#include <iostream>
#include <string>
#include <sstream>
#include <ctype.h>


using namespace std;

int atoi (string c) {
	stringstream s;
	int i;
	s << c;
	s >> i;
	return i;
}

int
main()
{
	string packed;
	string cur;
	string curi;
	bool new_s = false;
	int multp = 0;
	cin >> packed;
	for (char & c: packed) {
		if (isdigit (c) && !new_s) {
			curi += c;
		} else if (isdigit (c)) {
			multp = atoi (curi);
			for (int i = 0; i < multp; i++) {
				cout << cur;
			}
			cur = "";
			multp = atoi (curi);
			curi = c;
			new_s = false;
		} else {
			new_s = true;
			cur += c;
		}
	}
	multp = atoi (curi);
	for (int i = 0; i < multp; i++) {
		cout << cur;
	}
	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: ACCEPTED

Test 12

Group: 3

Verdict: ACCEPTED

Test 13

Group: 3

Verdict: ACCEPTED

Test 14

Group: 3

Verdict: ACCEPTED

Test 15

Group: 3

Verdict: ACCEPTED