X by kozima

let n,p=read_int()-1,print_char;;for y=0to n do
for x=0to n do(x=y||x+y=n)&()=p 'X'||x>y&x+y>n||()=p ' 'done;p '
'done

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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