Editorial for Lyndon's Golf Contest 1 P1 - As Easy As ABC
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In this problem, the key observation is that the ASCII value of each letter is equal to its position, offset by . A basic implementation might read the character via
scanf() and output its ASCII value, minus :
#include<stdio.h>
int c;int main(){scanf("%c",&c);printf("%d\n",c-64);}
This is pretty concise, but we can do a lot better. Abusing C's implicit int rule allows us to remove the type declarations, at the cost of a few warnings. This yields a -byte solution:
#include<stdio.h>
c;main(){scanf("%c",&c);printf("%d\n",c-64);}
Also, scanf() is rather long to simply fetch the first character. We can instead use getchar(), which does exactly that. This saves us another bytes:
#include<stdio.h>
main(){printf("%d\n",getchar()-64);}
Finally, to obtain the -byte solution, we realize that the
#include header is unnecessary, as C allows the declaration of most library functions without needing their headers:
main(){printf("%d\n",getchar()-64);}
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