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秀哥答案里给出的解题源代码少贴了len>=2的解题部分,自己在参考时,尝试作了补充,补充后的代码如下: int removeDuplicates(vector& nums) { int len=0; for(unsigned i=0;i<nums.size();i++){ if(len<2){ nums[len++]=nums[i]; } else{ if(nums[i]!=nums[len-2]){ nums[len++]=nums[i]; } } } return len; }