KN king Array ques, C (gcc)

KN king Array ques

//Title of this code

#include  <stdio.h>
#include<string.h>
#include <stdlib.h>
#include<time.h>

int main(void)
{
    int s;
    scanf("%d",&s);
    char a[s][s],flag[s][s];
   
    int i,j,rn,p1,p2,n;
    
     
        
    for(i=0;i<s;i++)
        for(j=0;j<s;j++)
        a[i][j]='-';
        
        for(i=0;i<s;i++)
        for(j=0;j<s;j++)
        flag[i][j]=0;
        
        
        srand( time(NULL));
    
    i=rand() % s;
    j=rand() % s;
     
    a[i][j]='A';
   
    
   
    
    n=0;
    p1=i;p2=j;
    while(n<25)
    {
        start:
        rn=(rand() % 500)%4;
        
        if(rn==0)
        {
            if(i-1>=0)
            {
                p1=i-1;
                p2=j;
            }
            else goto start;
        }
        
        else if(rn==1)
        {
            if(j+1<s)
            {
                p1=i;
                p2=j+1;
            }
            else goto start;
        }
        
        else if(rn==2)
        {
            if(i+1<s)
            {
                p1=i+1;
                p2=j;
            }
            else goto start;
        }
        
        else if(rn==3)
        {
            if(j-1>=0)
            {
                p1=i;
                p2=j-1;
            }
            else goto start;
        }
        
        if(flag[p1][p2]!=0)
            goto start;
        else 
            flag[p1][p2]++;
        
        a[p1][p2]='B'+n;
        
        i=p1;j=p2;
         
    
        n++;
        
    }
        
        
  for(i=0;i<s;i++)
    {
        printf("\n");
        {
            
            for(j=0;j<s;j++)
             printf("%c ",a[i][j]);
        }
    }
    
    return 0;
}


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