Please give me a proper solution of this program and also give the explanation how output will comes ?

Question

#include<stdio.h>
#include<string.h>
#include<conio.h>
int main()
{
char* c="GAMESOFTHRONE18";
char* p=c;
printf("%d",(int) strlen (c+2[p]-6[p]-1));
return 0;
}

//Output is:9

Answer 1

"Then c is offset by 6 so strlen is passed "FTHRONE18" which contains 9 characters."

I didn't realize that until

printf("%s", (c + 2[p] - 6[p] - 1));

Answer 2

c and p contains the address to the beginning of the string "GAMESOFTHRONE18".

2[p] is identical to *(p+2), which in turn is the same as p[2], or the character at index 2, which is M.
With the same logic 6[p] would then match the character F.

The ascii value for M is 77 and 70 for F.
77 - 70 = 7 - 1 = 6.

Then c is offset by 6 so strlen is passed "FTHRONE18" which contains 9 characters.