Solution to Single Number II based on bit operation

  • 0
    class Solution {
        int singleNumber(vector<int>& nums) {
            int acc1=0; 
            int acc2=0;
            for(int i=0;i<nums.size();++i){
                acc2 ^= acc1 & nums[i];
                acc1 ^= nums[i];
                int mask=~(acc2&acc1);
                acc1 &= mask;
                acc2 &= mask;
            return acc1; 

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