How unique function is working in this problem's solution

#1

class Solution {
public:
int removeDuplicates(vector& nums) {
nums.erase(unique(nums.begin(),nums.end()),nums.end());
return nums.size();
}
};

#2

Hey @gaurav19063 , What unique function in c++ vector does is , it takes all the unique elements in the vector and put it first in the vector itself . Now the elements which were repeated are put after the last index of unique numbers .
For ex:

    vector<int> v{1,2,3,1,2,3,3,4,5,4,5,6,7};  
    sort(v.begin(), v.end());   
    auto last = unique(v.begin(), v.end());  
    // v now holds {1 2 3 4 5 6 7 x x x x x x}, where 'x' is indeterminate  
    v.erase(last, v.end());

Hope it helps :blush: .
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Thankyou