摘要： 题目如下： The Fibonacci numbers, commonly denoted F(n) form a sequence, called the Fibonacci sequence, such that each number is the sum of the two precedi 阅读全文

摘要： 题目如下： Given the root of a binary tree with N nodes, each node in the tree has node.val coins, and there are Ncoins total. In one move, we may choose t 阅读全文

摘要： 题目如下： On a broken calculator that has a number showing on its display, we can perform two operations: Double: Multiply the number on the display by 2, 阅读全文

摘要： 题目如下： For a non-negative integer X, the array-form of X is an array of its digits in left to right order. For example, if X = 1231, then the array for 阅读全文

摘要： 题目如下： Given an array equations of strings that represent relationships between variables, each string equations[i] has length 4 and takes one of two d 阅读全文

摘要： 题目如下： Given an array of integers A, find the number of triples of indices (i, j, k) such that: 0 <= i < A.length 0 <= j < A.length 0 <= k < A.length A 阅读全文

摘要： 题目如下： In a country popular for train travel, you have planned some train travelling one year in advance. The days of the year that you will travel is 阅读全文

摘要： 题目如下： Given the root of a binary tree, each node has a value from 0 to 25representing the letters 'a' to 'z': a value of 0 represents 'a', a value of  阅读全文

摘要： 题目如下： Given two lists of closed intervals, each list of intervals is pairwise disjoint and in sorted order. Return the intersection of these two inter 阅读全文

摘要： 题目如下： We have an array A of integers, and an array queries of queries. For the i-th query val = queries[i][0], index = queries[i][1], we add val to A[ 阅读全文