摘要： N-QueensThen-queens puzzle is the problem of placingnqueens on ann×nchessboard such that no two queens attack each other.Given an integern, return all... 阅读全文

摘要： Palindrome Partitioning IIGiven a strings, partitionssuch that every substring of the partition is a palindrome.Return the minimum cuts needed for a p... 阅读全文

摘要： Evaluate Reverse Polish NotationEvaluate the value of an arithmetic expression inReverse Polish Notation.Valid operators are+,-,*,/. Each operand may ... 阅读全文

摘要： Combination SumGiven a set of candidate numbers (C) and a target number (T), find all unique combinations inCwhere the candidate numbers sums toT.Thes... 阅读全文

摘要： Insertion Sort ListSort a linked list using insertion sort.本题是插入排序的链表版本。传统数组版本做法就是两重循环，第一重是遍历所有元素，第二重是遍历已排序部分进行插入。链表版本类似，在遍历每个元素过程中，遍历已排序部分进行插入。/** * ... 阅读全文

摘要： Minimum Path SumGiven amxngrid filled with non-negative numbers, find a path from top left to bottom right whichminimizesthe sum of all numbers along ... 阅读全文

摘要： Reverse IntegerReverse digits of an integer.Example1:x = 123, return 321Example2:x = -123, return -321click to show spoilers.Have you thought about th... 阅读全文

摘要： Binary Tree Level Order Traversal IIGiven a binary tree, return thebottom-up level ordertraversal of its nodes' values. (ie, from left to right, level... 阅读全文

摘要： Distinct SubsequencesGiven a stringSand a stringT, count the number of distinct subsequences ofTinS.A subsequence of a string is a new string which is... 阅读全文

摘要： Search Insert PositionGiven a sorted array and a target value, return the index if the target is found. If not, return the index where it would be if ... 阅读全文