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9 of 9

edited body

edited Aug 10, 2020 at 5:25

C GCC, 40 bytes

f(int*a){a=*a^*++a?a[-(*a==a[1])]:f(a);}

Thanks to xibu for -5 bytes!

Thanks to ceilingcat for -2 bytes!

answered Jul 30, 2020 at 18:33