my code:

#include <stdio.h>
#include <math.h>
#include <string.h>
#include <conio.h>
int SL (int n)
{
  int q=n/1000, i, s=0;
  while (q>10)
  {
    s+=q%10;
    q/=10;
  }
  s+=q;
  return s;
}
int SR (int n)
{
  int s=0,q=n%1000;
  while (q>10)
  {
    s+=q%10;
    q/=10;
  }
  s+=q;
  return s;
}
void main()
{
  int S=0,T=0,N;
  scanf ("%d", &N);
  if ((SR(N+1)==SL(N+1))||(SR(N-1)==SL(N-1)))
    printf ("Yes");
  else printf ("No");
}

I remaked a bit your programm and it got acceped. What you need to change is SL and SR functions:

int SL(int n){
int q=n/1000, i, s=0;

    while(q!=0){
         s+=q%10;
         q/=10;
    }

return s;
}

int SR (int n){
int s=0, q=n%1000;

    while (q!=0)
    {
          s+=q%10;
          q/=10;
    }

return s;
}

Thanks for your code, i didn't need to write that myself :)