LeetCode 27. Remove Elemen

Remove Elemen

Des

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

这个题很简单，有个注意：如果使用erase(itr)函数的话，其删除之后要返回该元素后边的一个元素

Code

class Solution {
public:
int removeElement(vector<int>& nums, int val) {
for(vector<int>::iterator it=nums.begin();it!=nums.end();){
if(*it==val){
it=nums.erase(it);
}else{
it++;
}
}
return nums.size();
}
};