移除指定元素

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• 原题链接：https://leetcode.cn/problems/remove-element/

1.巧妙的移动元素

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

2.重复项删除类似

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