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LeetCode Day23 remove-element

class Solution {
public:
    int removeElement(vector<int>& nums, int val) {
        if(nums.empty()) return 0;
        int n=0;
        for(int i=0;i<nums.size();i++)
            if(nums[i]!=val)
                nums[n++]=nums[i];
        return n;
    }
};