LeetCode-26. Remove Duplicates from Sorted Array
Given a sorted array, remove the duplicates in-place such that each element appear only once 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.
Example:
Given nums = [1,1,2], Your function should return length = 2, with the first two elements of nums being 1 and 2 respectively. It doesn't matter what you leave beyond the new length.解体思路:此题比较简单,可以利用一个计数器记录重复元素的个数,对于不重复的元素则放在正确位置上。
class Solution {
public:
int removeDuplicates(vector<int>& nums) {
int count=0;
for(int i=1;i<nums.size();++i)
if(nums[i]==nums[i-1]) ++count;
else nums[i-count]=nums[i];
return nums.size()-count;
}
};