I had fix my code until like this, but still WA... Why??

#include<cstdio>
#include<algorithm>
#include<string.h>

using namespace std;

int main()
{
    char input[1000];
    char *kt1;
    char *kt2;
    int jum[1000];
    int jml,tot,cek;
    while(gets(input))
    {
      jml=0;
      memset(jum,0,sizeof(jum));
      if(strcmp(input,"-1")==0)
      {
        break;
      }
      kt1=strtok(input," ");
      kt2=strtok(NULL," ");
      printf("appx(%s,%s) = ",kt1,kt2); 
      int c=0;
      for(int i=0;i<strlen(kt1);i++)
      {
        for(int j=0;j<strlen(kt2);j++)
        {
          if(kt1[i]==kt2[j])
          {
            jum[c]++;
            int a=i+1;
            int b=j+1;
            while(a < strlen(kt1) && b < strlen(kt2))
            {
                if(kt1[a]==kt2[b])
                {
                  jum[c]++;
                }
                a++;
                b++;
            }
            c++;
          }
        }       
      }
      sort(jum,jum+c);
      jml=jum[c-1];
      jml=jml*2;
      tot=strlen(kt1)+strlen(kt2);
      if(jml > 0)
      {
        for(int k=1;k<=tot;k++)
        {
          if(jml % k == 0 && tot % k == 0)
          {
            jml=jml/k;
            tot=tot/k;
           }
        }
        for(int l=tot;l>=1;l--)
        {
          if(jml % l == 0 && tot % l == 0)
          {
            jml=jml/l;
            tot=tot/l;
           }
        }
      }
      //printf("%d %d\n",jml,tot);
      if(jml == 0)
      {
        printf("0\n",kt1,kt2);
      }
      else if(jml==tot)
      {
           printf("1\n",kt1,kt2);
      }
      else
      {
          printf("%d/%d\n",jml,tot);
      }
    }
    return 0;
}