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Given a string containing just the characters'('and')', find the length of the longest valid (well-formed) parentheses substring.For"(()", the longest... 阅读全文
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Given two numbers represented as strings, return multiplication of the numbers as a string.Note: The numbers can be arbitrarily large and are non-nega... 阅读全文
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Given a set ofnon-overlappingintervals, insert a new interval into the intervals (merge if necessary).You may assume that the intervals were initially... 阅读全文
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Given a collection of intervals, merge all overlapping intervals.For example,Given[1,3],[2,6],[8,10],[15,18],return[1,6],[8,10],[15,18].思路：首先以start排序，... 阅读全文
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Mergeksorted linked lists and return it as one sorted list. Analyze and describe its complexity.思路：开始做过两两合并的链表，此时做k路合并，即将k个链表进行合并，可以先将这k个链表进行两两合并，知道合并... 阅读全文
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Implementint sqrt(int x).Compute and return the square root ofx.这里给出两种实现方法：一是二分搜索，二是牛顿迭代法。1. 二分搜索对于一个非负数n，它的平方根不会小于大于（n/2+1）。在[0, n/2+1]这个范围内可以进行二分搜索，... 阅读全文
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Given an unsorted integer array, find the first missing positive integer.For example,Given[1,2,0]return3,and[3,4,-1,1]return2.Your algorithm should ru... 阅读全文
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Given inorder and postorder traversal of a tree, construct the binary tree.Note:You may assume that duplicates do not exist in the tree.C++实现代码：#inclu... 阅读全文
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Given preorder and inorder traversal of a tree, construct the binary tree.Note:You may assume that duplicates do not exist in the tree.提交成功的代码：C++实现：#... 阅读全文
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Dynamic ProgrammingGiven a stringSand a stringT, count the number of distinct subsequences ofTinS.A subsequence of a string is a new string which is f... 阅读全文