Leetcodes Solutinos 26 Remove Duplicates from Sorted Array

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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 doesnt matter what you leave beyond the new length.

思路1

只把不相等的元素用id存到數組的最前面

class Solution {public: int removeDuplicates(vector<int>& nums){ int n = nums.size(); if(n < 2) return n; int id = 1; for(int i = 1; i < n; ++i) if(nums[i] != nums[i-1]) nums[id++] = nums[i]; return id; }};

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