LeetCode 27: Remove Element

Remove Element

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

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

解题思路

使用两个指针即可，代码如下：

class Solution {
public:
int removeElement(vector<int>& nums, int val) {
int i = 0, j = nums.size() - 1;
while (i <= j) {
if (nums[i] == val) {
nums[i] = nums[j--];
}
else {
i++;
}
}
return i;
}
};