Unique Number III problem

#1

not able to pass the test cases. please help me with whats wrong in the code.
link is below:

#2 
if (sum % 3 == 1) {
            ans += (1 << i);
   }

This statement is not written correctly

ithas to be
if (sum % 3) {
ans += (1 << j);
}

#3

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