287. Find the Duplicate Number

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 class Solution {

public:

    int findDuplicate(vector<int>& nums) {

        map<int,int>m;

        for(int i=0;i<nums.size();i++){

            if(m[nums[i]]>=1)

                return nums[i];

            else {

                m[nums[i]]++;

            }

        }

        return -1;

    }

};

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