Leetcode problem 136. 'Single Number'

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 class Solution {
    public int singleNumber(int[] nums) {
        int c = 0, a = 0, b = 0;
        for(int i = 0; i<nums.length; i++){
            for(int j = 0; j<nums.length; j++){
                if(nums[i] == nums[j])
                    c++;
            }
            if(c==1){
                a = 1;
                b = nums[i];
                break;
            }
            c=0;    
        }
        if(a == 1)
            return b;
        else
            return 0;    
    }
}

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