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摘要： You are climbing a stair case. It takesnsteps to reach to the top.Each time you can either climb 1 or 2 steps. In how many distinct ways can you climb... 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： Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases.Example"A man, a plan, a canal: Panama" i... 阅读全文

摘要： Valid ParenthesesGiven a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.ExampleThe brac... 阅读全文

摘要： Given a sorted (increasing order) array, Convert it to create a binary tree with minimal height.ExampleGiven [1,2,3,4,5,6,7], return 4 / \ 2 ... 阅读全文

摘要： Longest Increasing Continuous subsequenceGive you an integer array (index from 0 to n-1, where n is the size of this array)，find the longest increasin... 阅读全文

摘要： Binary Tree PathsGiven a binary tree, return all root-to-leaf paths.ExampleGiven the following binary tree: 1 / \2 3 \ 5All root-to-leaf path... 阅读全文

摘要： SubtreeYou have two every large binary trees: T1, with millions of nodes, and T2, with hundreds of nodes. Create an algorithm to decide if T2 is a sub... 阅读全文

摘要： Reverse digits of an integer. Returns 0 when the reversed integer overflows (signed 32-bit integer).ExampleGiven x = 123, return 321Given x = -123, re... 阅读全文

摘要： Maximum SubarrayGiven an array of integers, find a contiguous subarray which has the largest sum.ExampleGiven the array [−2,2,−3,4,−1,2,1,−5,3], the c... 阅读全文