Leetcode 27 Remove Element(移除数组中的指定元素)

Mr丶Caleb

于 2016-12-05 20:02:36 发布

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本文介绍了一种在不使用额外空间的情况下从数组中移除指定值的方法，并保持了常数级别的内存消耗。通过遍历数组并跳过目标值的方式实现了这一目标。最终返回去除指定值后的数组长度。

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Given an array and a value, remove all instances of that value in place and return the new length.

Do not allocate extra space for another array, you must do this in place with constant memory.

The order of elements can be changed. It doesn’t matter what you leave beyond the new length.

Example:
Given input array nums = [3,2,2,3], val = 3

Your function should return length = 2, with the first two elements of nums being 2.

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