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Got rid of `if` and `else`.

edited Aug 21, 2019 at 18:14

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C (gcc), 180 168 bytes

f(char*s){int j=strlen(s),m=j--/2,p=-1,i=0;for(;p&&i<m;j--,i++){s[i]^s[j]&&(p<0&&(s[i+1]==s[j]&&(p=++i)||s[i]==s[j-1]&&(p=j--+1)||p++)||p++);}return*s&&p<0?m+1:p?p:-1;}

Try it online!

answered Aug 21, 2019 at 17:34

G. Sliepen

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