題目

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.

分析

給定一個數組，去除所有給定值的元素，并返回剩下的數組長度。數組是個指針類型，直接替換掉其中元素即可。C代碼如下，已通過。

int removeElement(int* nums, int numsSize, int val) {
    int ans=0;
    for(int i=0;i<numsSize;i++)
    {
        if(nums[i]!=val)
        {
            nums[ans]=nums[i];
            ans++;
        }
    }
    return ans;
}