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摘要： 第一种:Mapmap=newHashMap();Iteratoriter=map.entrySet().iterator();while(iter.hasNext()){Map.Entryentry=(Map.Entry)iter.next();Objectkey=entry.getKey();Ob... 阅读全文

摘要： 12 位运算 C语言是为描述系统设计的，因此它应该具有汇编语言所以完成的一些功能。C语言既有高级语言的特点，又具有低级语言的功能。因而具有广泛的用途和很强的生命力。12.1 位运算符和位运算运算符 含义& 按位与| 按位或^ 按位异或~ 取反> 右移说明：（1）位运算... 阅读全文

摘要： Given 3*n + 1 numbers, every numbers occurs triple times except one, find it.ExampleGiven [1,1,2,3,3,3,2,2,4,1] return 4ChallengeOne-pass, constant ex... 阅读全文

摘要： The structure of Segment Tree is a binary tree which each node has two attributes start and end denote an segment / interval.start and end are both in... 阅读全文

摘要： Implement a stack with min() function, which will return the smallest number in the stack.It should support push, pop and min operation all in O(1) co... 阅读全文

摘要： Given a string S and a string T, count the number of distinct subsequences of T in S.A subsequence of a string is a new string which is formed from th... 阅读全文

摘要： Givenn, generate all structurally uniqueBST's(binary search trees) that store values 1...n.ExampleGivenn= 3, your program should return all 5 unique B... 阅读全文

摘要： Given n, how many structurally unique BSTs (binary search trees) that store values 1...n?ExampleGiven n = 3, there are a total of 5 unique BST's.1 ... 阅读全文

摘要： Given an integer array, find a continuous subarray where the sum of numbers is the biggest. Your code should return the index of the first number and ... 阅读全文

摘要： Implement pow(x, n).NoteYou don't need to care about the precision of your answer, it's acceptable if the expected answer and your answer 's differenc... 阅读全文