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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： mplement a SnapshotArray that supports the following interface: SnapshotArray(int length) initializes an array-like data structure with the given leng 阅读全文

摘要： A cryptarithmetic puzzle is a mathematical game where the digits of some numbers are represented by letters. Each letter represents a unique digit. Fo 阅读全文

摘要： There are N courses, labelled from 1 to N. We are given relations[i] = [X, Y], representing a prerequisite relationship between course X and course Y: 阅读全文

摘要： Given a non-decreasing array of positive integers nums and an integer K, find out if this array can be divided into one or more disjoint increasing su 阅读全文

摘要： Typically, an implementation of in-order traversal of a binary tree has O(h) space complexity, where h is the height of the tree. Write a program to c 阅读全文

摘要： Given a sorted array of non-negative integers, find the smallest positive integer that is not the sum of a subset of the array. For example, for the i 阅读全文

摘要： LeetCode 424. Longest Repeating Character Replacement Given a string that consists of only uppercase English letters, you can replace any letter in th 阅读全文

摘要： Given a set of closed intervals, find the smallest set of numbers that covers all the intervals. If there are multiple smallest sets, return any of th 阅读全文

摘要： Given a string which we can delete at most k, return whether you can make a palindrome. For example, given 'waterrfetawx' and a k of 2, you could dele 阅读全文