Interview Classic 150 Questions P27 Remove Element

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Timeline

Timeline

2025-09-28

init

Two pointers

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Problem:

P27 Remove Element

https://leetcode.cn/problems/remove-element/description/?envType=study-plan-v2&envId=top-interview-150

Simple but classic two-pointer problem, just like her classic floral dress~

#include <vector>
using std::vector;

class Solution {
public:
  int removeElement(vector<int> &nums, int val) {
    int i = 0 , k = nums.size() - 1;

    while (i <= k) {
      if (nums[i] == val) {
        std::swap(nums[i], nums[k]);
        k--;

      } else {
        i++;
      }
    }

    return k + 1;
  }
};