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added 46 characters in body

edited Dec 28, 2017 at 4:22

edited Dec 28, 2017 at 4:22

C, (削除) 62 (削除ここまで) 58 bytes

Thanks to @Dennis for saving four bytes!

f(char*s){*++s>32||(s[-1]^=s[-2]^=s[-1]^=s[-2]);*s&&f(s);}

Recursive version (58 bytes):

f(char*s){*++s-32&&*s||(s[-1]^=s[-2]^=s[-1]^=s[-2]);*s&&f(s);}

answered Dec 27, 2017 at 19:59