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27. 移除元素-EASY.js
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27. 移除元素-EASY.js
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// https://leetcode.cn/problems/remove-element/
/**
* @param {number[]} nums
* @param {number} val
* @return {number}
*/
const paramNums = [3, 2, 2, 3];
const paramVal = 3;
/**
* 双指针法
*/
var removeElement = function (nums, val) {
let len = nums.length;
let fast = 0;
let slow = 0;
while (fast < len) {
if (nums[fast] != val) {
nums[slow] = nums[fast];
slow++;
}
fast++;
}
return slow;
};
console.log(removeElement(paramNums, paramVal));
/**
* 双指针法优化
*/
var removeElement = function (nums, val) {
let left = 0;
let right = nums.length;
while (left < right) {
if (nums[left] == val) {
nums[left] = nums[right - 1];
right--;
} else {
left++;
}
}
return left;
};
console.log(removeElement(paramNums, paramVal));