leetcode-Easy-第8期-陣列型別-Remove Element

摘要： 題目：在不建立新的陣列下，移除陣列中所有給定的值 Given an arraynums and a valueval , remove all instances of that value in-plac...

題目：在不建立新的陣列下，移除陣列中所有給定的值

Given an arraynums and a valueval , remove all instances of that value in-place and return the new length.

Do not allocate extra space for another array, you must do this by modifying the input arrayin-place with O(1) extra memory.

The order of elements can be changed. It doesn't matter what you leave beyond the new length.

• Example

Given nums = [3,2,2,3], val = 3
移除目標值3陣列變成：[2,2]
所以返回長度為2

• 解法一

var removeElement = function(nums, val) {
const len = nums.length
for(let i = 0; i < len; i++){
if(nums[i] !== val){
nums.push(nums[i])
}
}
nums.splice(0,len)
return nums.length

};

• 解法二

const len = nums.length
for(let i = 0; i < len; i++){
if(nums[i] !== val){
nums.splice(i,1)
}
}
return nums.length