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C GCC, 4140 bytes
f(int*a){*a=*a^*++aa=*a^*++a?a[-(*a==a[1])]:f(a);}
Try it online!Try it online!
Thanks to xibu for -5 bytes!
Thanks to ceilingcat for -1 byte2 bytes!
C GCC, 41 bytes
f(int*a){*a=*a^*++a?a[-(*a==a[1])]:f(a);}
Try it online!
Thanks to ceilingcat for -1 byte!
C GCC, 40 bytes
f(int*a){a=*a^*++a?a[-(*a==a[1])]:f(a);}
Thanks to ceilingcat for -2 bytes!
C GCC, 4241 bytes
r;ff(int*a){r=*a^*++a*a=*a^*++a?a[-(*a==a[1])]:f(a);}
C GCC, 42 bytes
r;f(int*a){r=*a^*++a?a[-(*a==a[1])]:f(a);}
C GCC, 4342 bytes
r;f(int*a){r=*a^a[1]r=*a^*++a?a[a[1]!=a[2]]a[-(*a==a[1])]:f(a+1a);}
C GCC, 43 bytes
r;f(int*a){r=*a^a[1]?a[a[1]!=a[2]]:f(a+1);}
