Find All Elements With Frequency Zero

#1

Output format is not clearly mentioned. Only one test case is passed.please help me getting AC.

#2

Hey, i think your logic is incorrect as well.This is the right code.

        vector ret;
        
        for(int i = 0; i < nums.size();i++) {
            
            if(nums[abs(nums[i])-1] < 0) ret.push_back(abs(nums[i]));
            else nums[abs(nums[i])-1] *= -1;
            
        }

        return ret;
#3

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