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Commit8b8f1d9

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committed
add 20, 34, 40
1 parentff3c138 commit8b8f1d9

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4 files changed

+71
-0
lines changed

4 files changed

+71
-0
lines changed

‎Easy/20-validParentheses.js‎

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/**
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*@param {string} s
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*@return {boolean}
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*/
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varisValid=function(s){
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varstack=[];
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for(vari=0;i<s.length;i++){
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if(s[i]==='('||s[i]==='['||s[i]==='{'){
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stack.push(s[i]);
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}
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if(s[i]===')'){
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if(stack[stack.length-1]!=='(')returnfalse;
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elsestack.pop()
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}
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if(s[i]===']'){
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if(stack[stack.length-1]!=='[')returnfalse;
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elsestack.pop();
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}
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if(s[i]==='}'){
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if(stack[stack.length-1]!=='{')returnfalse;
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elsestack.pop();
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}
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}
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if(stack.length===0)returntrue;
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elsereturnfalse;
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};

‎Medium/34-searchforRange.js‎

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@@ -20,6 +20,7 @@ var searchRange = function(nums, target) {
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hi=nums.length-1;
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while(lo<hi){
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// this +1 is very important!!! Make mid biased to the right
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varmid=lo+Math.floor((hi-lo)/2)+1;
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if(nums[mid]>target)hi=mid-1;
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elselo=mid;

‎Medium/40-combinationSumII.js‎

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/**
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*@param {number[]} candidates
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*@param {number} target
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*@return {number[][]}
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*/
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varcombinationSum2=function(candidates,target){
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candidates.sort(function(a,b){
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returna-b;
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});
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varresult=[];
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varresults=[];
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combinationSum2Helper(candidates,result,results,target,0);
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returnresults;
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};
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varcombinationSum2Helper=function(candidates,result,results,target,start){
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if(target===0){
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results.push(deepCopy(result));
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return;
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}
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for(vari=start;i<candidates.length;i++){
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if(target<0)break;
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if(i>start&&candidates[i]===candidates[i-1]){
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continue;
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}else{
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result.push(candidates[i]);
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combinationSum2Helper(candidates,result,results,target-candidates[i],i+1);
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result.pop();
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}
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}
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};
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vardeepCopy=function(nums){
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varnewNums=[];
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for(vari=0;i<nums.length;i++)newNums.push(nums[i]);
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returnnewNums;
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};

‎README.md‎

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@@ -10,6 +10,7 @@
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*[9. Palindrome Number](https://leetcode.com/problems/palindrome-number/) -[Solution](./Easy/9-palindromeNumber.js)
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*[14. Longest Common Prefix](https://leetcode.com/problems/longest-common-prefix/) -[Solution](./Easy/14-longestCommonPrefix.js)
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*[19. Remove Nth Node From End of List](https://leetcode.com/problems/remove-nth-node-from-end-of-list/) -[Solution](./Easy/19-removeNthNodeFromEndofList.js)
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*[20. Valid Parentheses](https://leetcode.com/problems/valid-parentheses/) -[Solution](./Easy/20-validParentheses.js)
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*[21. Merge Two Sorted Lists](https://leetcode.com/problems/merge-two-sorted-lists/) -[Solution](./Easy/21-mergeSortedLists.js)
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*[24. Swap Nodes in Pairs](https://leetcode.com/problems/swap-nodes-in-pairs/) -[Solution](./Easy/24-swapNodesPairs.js)
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*[28. Implement strStr()](https://leetcode.com/problems/implement-strstr/) -[Solution](./Easy/28-implementstrStr.js)
@@ -80,6 +81,7 @@
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*[31. Next Permutation](https://leetcode.com/problems/next-permutation/) -[Solution](./Medium/31-nextPermutation.js)
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*[34. Search for a Range](https://leetcode.com/problems/search-for-a-range/) -[Solution](./Medium/34-searchforRange.js)
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*[39. Combination Sum](https://oj.leetcode.com/problems/combination-sum/) -[Solution](./Medium/39-combinationSum.js)
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*[40. Combination Sum II](https://oj.leetcode.com/problems/combination-sum-ii/) -[Solution](./Medium/40-combinationSumII.js)
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*[46. Permutations](https://leetcode.com/problems/permutations/) -[Solution](./Medium/46-permutations.js)
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*[48. Rotate Image](https://leetcode.com/problems/rotate-image/) -[Solution](./Medium/48-rotateImage.js)
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*[53. Maximum Subarray](https://leetcode.com/problems/maximum-subarray/) -[Solution](./Medium/53-maximumSubarray.js)

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