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Commit01ccda9

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add: Search for a Range
1 parent4ad4079 commit01ccda9

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‎README.md

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|19|[Remove Nth Node From End of List](https://leetcode.com/problems/remove-nth-node-from-end-of-list/)|[JavaScript](./src/remove-nth-node-from-end-of-list/res.js)|Medium|
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|22|[Generate Parentheses](https://leetcode.com/problems/generate-parentheses/)|[JavaScript](./src/generate-parentheses/res.js)|Medium|
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|26|[Remove Duplicates from Sorted Array](https://leetcode.com/problems/remove-duplicates-from-sorted-array/)|[JavaScript](./src/remove-duplicates-from-sorted-array/res.js)|Easy|
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|34|[Search for a Range](https://leetcode.com/problems/search-for-a-range/)|[JavaScript](./src/search-for-a-range/res.js)|Medium|
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|48|[Rotate Image](https://leetcode.com/problems/rotate-image/)|[JavaScript](./src/rotate-image/res.js)|Medium|
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|66|[Plus One](https://leetcode.com/problems/plus-one/)|[JavaScript](./src/plus-one/res.js)|Easy|
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|69|[Sqrt(x)](https://leetcode.com/problems/sqrtx/)|[JavaScript](./src/sqrtx/res.js)|Easy|

‎src/search-for-a-range/res.js

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// Given an array of integers sorted in ascending order, find the starting and ending position of a given target value.
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// Your algorithm's runtime complexity must be in the order of O(log n).
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// If the target is not found in the array, return [-1, -1].
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// For example,
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// Given [5, 7, 7, 8, 8, 10] and target value 8,
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// return [3, 4].
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/**
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* res.js
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*@authors Joe Jiang (hijiangtao@gmail.com)
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*@date 2017-02-26 22:56:22
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*@version $Id$
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*
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*@param {number[]} nums
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*@param {number} target
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*@return {number[]}
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*/
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letsearchRange=function(nums,target){
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letarrlen=nums.length;
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if(!arrlen){
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return[-1,-1];
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}
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letleftIndex=binarySearch(nums,0,arrlen-1,target,'l'),rightIndex;
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if(leftIndex===-1){
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return[-1,-1];
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}else{
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rightIndex=binarySearch(nums,leftIndex,arrlen-1,target,'r');
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}
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return[leftIndex,rightIndex];
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};
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letbinarySearch=function(nums,begin,end,target,type){
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letarrlen=nums.length;
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while(begin<=end){
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letmid=begin+Number.parseInt((end-begin)/2),
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midVal=nums[mid];
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if(midVal===target){
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switch(type){
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case'l':
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if(mid===0||nums[mid-1]!==target){
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returnmid;
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}else{
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end=mid-1;
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}
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break;
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default:
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if(mid===arrlen-1||nums[mid+1]!==target){
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returnmid;
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}else{
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begin=mid+1;
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}
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break;
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}
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}elseif(midVal>target){
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end=mid-1;
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}elseif(midVal<target){
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begin=mid+1;
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}
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}
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return-1;
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};

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