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摘要： You are given coins of different denominations and a total amount of money amount. Write a function to compute the fewest number of coins that you nee 阅读全文

摘要： Given an integer array nums with all positive numbers and no duplicates, find the number of possible combinations that add up to a positive integer ta 阅读全文

摘要： Given a non-negative integer num, repeatedly add all its digits until the result has only one digit. Example Given num = 38. The process is like: 3 + 阅读全文

摘要： Given an array with positive and negative numbers, find the maximum average subarray which length should be greater or equal to given length k. Exampl 阅读全文

摘要： Find the maximum node in a binary tree, return the node. Example Given a binary tree: 1 / \ -5 2 / \ / \ 0 3 -4 -5 return the node with value 3. 1 pub 阅读全文

摘要： Given a Binary Search Tree (BST), convert it to a Greater Tree such that every key of the original BST is changed to the original key plus sum of all 阅读全文

摘要： We are playing the Guess Game. The game is as follows: I pick a number from 1 to n. You have to guess which number I picked. Every time you guess wron 阅读全文

摘要： Given two strings, write a method to decide if one is a permutation of the other. Example abcd is a permutation of bcad, but abbe is not a permutation 阅读全文

摘要： Given a binary tree, find all paths that sum of the nodes in the path equals to a given number target. A valid path is from root node to any of the le 阅读全文

摘要： Convert a binary search tree to doubly linked list with in-order traversal. Example Given a binary search tree: 4 / \ 2 5 / \ 1 3 return 1<->2<->3<->4 阅读全文