摘要：Given n points on a 2D plane, find the maximum number of points that lie on the same straight line.##思路关键是浮点数做key不靠谱，struct hash以及 int calcGCD(int a, ... 阅读全文

摘要：[最近公共祖先LCA](https://github.com/julycoding/The-Art-Of-Programming-By-July/blob/master/ebook/zh/03.03.md)##双链BT如果每个结点都有一个指针指向它的父结点，于是我们可以从任何一个结点出发，得到一个到... 阅读全文

摘要：Evaluate the value of an arithmetic expression inReverse Polish Notation.Valid operators are+,-,*,/. Each operand may be an integer or another ex... 阅读全文

摘要：如果不假思索地脱口而出24次，你就被直觉骗了咯 阅读全文

摘要：Given a string s, partition s such that every substring of the partition is a palindrome. 阅读全文

摘要：Given a 2D board and a word, find if the word exists in the grid. 阅读全文

摘要：Sort a linked list in O(n log n) time using constant space complexity. 阅读全文

摘要：在数组中的两个数字，如果前面一个数字大于后面的数字，则这两个数字组成一个逆序对。输入一个数组，求出这个数组中的逆序对的总数。 阅读全文

摘要：Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity. 阅读全文

摘要：Find the maximum number of flags that can be set on mountain peaks. 阅读全文

摘要：Divide an array into the maximum number of same((-))sized blocks, each of which should contain an index P such that A[P - 1] A[P + 1]. 阅读全文

摘要：Given a log of stock prices compute the maximum possible earning. 阅读全文

摘要：Find a maximum sum of a compact subsequence of array elements and any double slice. 阅读全文

摘要：Write a function:int solution(int A, int B, int K);that, given three integers A, B and K, returns the number of integers within the range [A..B] that ... 阅读全文

摘要：####Median of Two Sorted Arrays >There are two sorted arrays A and B of size m and n respectively. Find the median of the two sorted arrays. The overa... 阅读全文

摘要：There areNgas stations along a circular route, where the amount of gas at stationiisgas[i].You have a car with an unlimited gas tank and it costscost[... 阅读全文

摘要：N voracious fish are moving along a river. Calculate how many fish are alive.You are given two non-empty zero-indexed arrays A and B consisting of N i... 阅读全文

摘要：Cover "Manhattan skyline" using the minimum number of rectangles.You are going to build a stone wall. The wall should be straight and N meters long, a... 阅读全文

摘要：Find an index of an array such that its value occurs at more than half of indices in the array.A zero-indexed array A consisting of N integers is give... 阅读全文

摘要：Given an array A of N integers, we draw N discs in a 2D plane such that the I-th disc is centered on (0,I) and has a radius of A[I]. We say that the J... 阅读全文