leetcode解题之 27. Remove Element Java版

27. Remove Element

Given an array nums and a value val, 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 by modifying the input array in-place with O(1) extra memory.

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

Example 1:

Given nums = [3,2,2,3], val = 3,

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

It doesn’t matter what you leave beyond the returned length.

解题方法

这道题让我们移除一个数组中和给定值相同的数字，并返回新的数组的长度。是一道比较容易的题，我们只需要一个变量用来计数，然后遍历原数组，如果当前的值和给定值不同，我们就把当前值覆盖计数变量的位置，并将计数变量加1。代码如下

class Solution {
    public int removeElement(int[] nums, int val) {
    int len=0;
        for(int j=0;j<nums.length;j++){
            if(nums[j]!=val){
               nums[len]=nums[j];
                len++;
            }
        }
        return len;
 }
}

运行结果