Undoc'd Feature?

[toml_12953]

(07-03-2022 06:24 PM)Wes Loewer Wrote:  

(07-03-2022 02:18 PM)toml_12953 Wrote:  Here's the entire C program:

Code:


main()
 {
   int x,y,r,s,t,n,a[9];

   for(n=1000;n>0;--n){
     r=8;
     s=0;
     x=0;
     do{
       a[++x]=r;
       do{
         ++s;
         y=x;
         while(y>1)
           if (!(t=a[x]-a[--y]) || x-y==abs(t)){
             y=0;
             while(!--a[x])
               --x;
           }
       } while(y!=1);
     } while(x!=r);
   }
   printf("%d",s);
 }

What an interesting little program. I cannot begin to image what it is trying to calculate. Whatever it is doing, it repeats the exact same calculation 1000 times, and a[0] never gets initialized or used.

Do tell, what is this?

It's the nqueens problem from here:

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