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Dear Subscribers,
We sincerely apologize for the recent issues on our channel. Unfortunately, due to an illegal bot attack that sent inappropriate content during the night, one of our C programming channels was banned, and another faced serious trouble but has now been recovered.
We take full responsibility for this and deeply regret any inconvenience or discomfort caused. We are working harder to improve our security and prevent this from happening again.
Thank you for your understanding and continued support. 🙏

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class Solution {
public:
    int removeDuplicates(vector<int>& nums) {
        int lastUniqueElementIdx = 0;

        for (int i = 1; i < nums.size(); i++) {
            if (nums[lastUniqueElementIdx] != nums[i]) {
                nums[lastUniqueElementIdx + 1] = nums[i];
                lastUniqueElementIdx++;
            }
        }
        return lastUniqueElementIdx + 1;
    }
};