Single number ii

class Solution {
public:
    int singleNumber(int A[], int n) {
        // Note: The Solution object is instantiated only once and is reused by each test case.
        if (n == 0) return 0;
        
        int bit[32];
        int result = 0;
        
        for (int i = 0; i < 32; i++){
            
            bit[i] = 0;
            for (int j = 0; j < n; j++){
                
                if ((A[j] >> i) & 1) bit[i] = (bit[i] + 1) % 3;
            }
            result += (bit[i]<<i);
        }
        return result;
    }
};