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Commita6c9f75

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Merge pull requestneetcode-gh#1843 from andynullwong/0239
Update 0239-sliding-window-maximum.js
2 parents76f44ec +e9b2665 commita6c9f75

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‎javascript/0239-sliding-window-maximum.js

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Original file line numberDiff line numberDiff line change
@@ -80,3 +80,60 @@ var maxSlidingWindow = function (nums, k) {
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}
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returnoutput;
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};
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/**
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*@param {number[]} nums
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*@param {number} k
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*@return {number[]}
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*/
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// Deque Implementation using Lazy Deletion
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classLazyDeletionDeque{
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constructor(){
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this.deque=[];
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this.leftIdx=0;
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}
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isEmpty=()=>{
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returnthis.deque.length===this.leftIdx;
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};
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push=(num)=>{
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this.deque.push(num);
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};
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popFront=()=>{
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this.leftIdx++;
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};
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popBack=()=>{
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!this.isEmpty()&&this.deque.pop();
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};
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front=()=>{
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returnthis.deque[this.leftIdx];
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};
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back=()=>{
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returnthis.deque[this.deque.length-1];
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};
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}
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varmaxSlidingWindowWithLazyDeletionDeque=function(nums,k){
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constdeque=newLazyDeletionDeque();
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constanswer=[];
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letleftWindow=0;
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for(letrightWindow=0;rightWindow<nums.length;rightWindow++){
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constrightNum=nums[rightWindow];
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while(!deque.isEmpty()&&rightNum>deque.back()){
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deque.popBack();
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}
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deque.push(rightNum);
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if(rightWindow>=k-1){
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constdequeFront=deque.front();
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constleftNum=nums[leftWindow];
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if(leftNum===dequeFront){
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deque.popFront();
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}
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answer.push(dequeFront);
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leftWindow++;
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}
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}
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returnanswer;
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};

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