Pakkaus

#include <sstream>
#include <stdio.h>
#include <stdlib.h>
#include <iostream>
#include <string>
#include <ctype.h>
#include <cstdlib>
using namespace std;

int main()
{
    string data;
    getline (cin, data);
    string L1;
    string L2;
    string L3;
    string fin;
    int N1 = 0;
    int N2 = 0;
    int pos1 = 0;
    int pos2 = 0;
    int kerta = 1;
    int N3 = 0;
	int num = data.length();
    int pos = 0;
    while (pos-1 < num)
    {
        pos1 = data.find_first_of ("0123456789",pos);
        if (kerta == 1)
        {
            L1 = data.substr (pos, 1);
            N1 = atoi(L1.c_str());
            pos++;
            pos2 = data.find_first_of ("0123456789",pos);
            N2 = pos2-pos1-1;
            L2 = data.substr (pos1+1, N2);
            L3 = L2;
            for (int i=1;i<N1;i++)
            {
               L2 = L2 + L3;
            }
            fin = fin + L2;
            L1 = data.substr (pos2, 1);
            N3 = atoi(L1.c_str());
            L2 = "";
            N1 = 0;
            N2 = 0;
            pos1 = pos2;
            kerta = 2;
            pos++;
        }
        else
        {
            pos2 = data.find_first_of ("0123456789",pos1+1);
            if (data.find_first_of ("0123456789",pos1+1)== string::npos)
            {
                N2 = num-pos1-1;
                L2 = data.substr (pos1+1, N2);
                L3 = L2;
                for (int i=1;i<N3;i++)
                {
                    L2 = L2+L3;
                }
                fin = fin + L2;
                break;
            }
            else
            {
                N2 = pos2-pos1-1;
                L2 = data.substr (pos1+1, N2);
                L3 = L2;
                for (int i=1;i<N3;i++)
                {
                    L2 = L2+L3;
                }
                fin = fin + L2;
                L1 = data.substr (pos, 1);
                N3 = atoi(L1.c_str());
                N1 = 0;
                N2 = 0;
                pos1 = pos2;
                pos++;
            }
        }
    }
    cout<<fin;
return 0;
}

Test 1

Group: 1

Verdict: RUNTIME ERROR

terminate called after throwing an instance of 'std::out_of_range'
  what():  basic_string::substr

Test 2

Group: 1

Verdict: WRONG ANSWER

Test 3

Group: 1

Verdict: WRONG ANSWER

Test 4

Group: 1

Verdict: WRONG ANSWER

Test 5

Group: 1

Verdict: WRONG ANSWER

Test 6

Group: 2

Verdict: RUNTIME ERROR

terminate called after throwing an instance of 'std::out_of_range'
  what():  basic_string::substr

Test 7

Group: 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: 3

Verdict: RUNTIME ERROR

terminate called after throwing an instance of 'std::out_of_range'
  what():  basic_string::substr

Test 12

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 13

Group: 3

Verdict: WRONG ANSWER

Test 14

Group: 3

Verdict: WRONG ANSWER

Test 15

Group: 3

Verdict: WRONG ANSWER