玲珑子

摘要：题目： Calculate the sum of two integers a and b, but you are not allowed to use the operator + and -. Example:Given a = 1 and b = 2, return 3. 代码： 使用移位来 阅读全文

摘要：题目： Given a non-negative integer num, repeatedly add all its digits until the result has only one digit. For example: Given num = 38, the process is l 阅读全文

摘要：题目： Given an array of integers where 1 ≤ a[i] ≤ n (n = size of array), some elements appear twice and others appear once. Find all the elements of [1, 阅读全文

摘要：题目： Invert a binary tree. 4 / \ 2 7 / \ / \ 1 3 6 9 to 4 / \ 7 2 / \ / \ 9 6 3 1 代码： Invert a binary tree. 自己的（递归实现）： 别人的： 自己的（使用队列，非递归实现）: 非递归和递归的在Le 阅读全文

摘要：题目： Given a word, you need to judge whether the usage of capitals in it is right or not. We define the usage of capitals in a word to be right when on 阅读全文

摘要：题目： Given a binary tree, find its maximum depth. The maximum depth is the number of nodes along the longest path from the root node down to the farthe 阅读全文

摘要：题目： Given a binary array, find the maximum number of consecutive 1s in this array. Example 1: Note: The input array will only contain 0 and 1. The len 阅读全文

摘要：题目： Given an array of integers, every element appears twice except for one. Find that single one. Note:Your algorithm should have a linear runtime com 阅读全文

摘要：题目： You are playing the following Nim Game with your friend: There is a heap of stones on the table, each time one of you take turns to remove 1 to 3 阅读全文

摘要：题目： anysubsequence of the other strings. A subsequence is a sequence that can be derived from one sequence by deleting some characters without changin 阅读全文

摘要：题目： Given a non-empty binary tree, return the average value of the nodes on each level in the form of an array. Example 1: Input: 3 / \ 9 20 / \ 15 7 阅读全文

摘要：题目： You are given two arrays (without duplicates) nums1 and nums2 where nums1’s elements are subset of nums2. Find all the next greater numbers for nu 阅读全文

摘要：题目： You are given a map in form of a two-dimensional integer grid where 1 represents land and 0 represents water. Grid cells are connected horizontall 阅读全文

摘要：题目： X city opened a new cinema, many people would like to go to this cinema. The cinema also gives out a poster indicating the movies’ ratings and des 阅读全文

摘要：1.to_string函数 C++11新增的函数，c++11标准增加了全局函数std::to_string，以及std::stoi/stol/stoll等等函数（string转int，long，以及long long） string to_string (int val);string to_str 阅读全文

摘要：题目： Write a program that outputs the string representation of numbers from 1 to n. But for multiples of three it should output “Fizz” instead of the n 阅读全文

摘要：题目： Write a function that takes a string as input and returns the string reversed. Example:Given s = "hello", return "olleh". 代码： 自己的： 1 class Solutio 阅读全文

摘要：题目： In MATLAB, there is a very useful function called 'reshape', which can reshape a matrix into a new one with different size but keep its original d 阅读全文

摘要：题目： Given an integer array with even length, where different numbers in this array represent different kinds of candies. Each number means one candy o 阅读全文

摘要：题目： Given a string, you need to reverse the order of characters in each word within a sentence while still preserving whitespace and initial word orde 阅读全文

摘要：题目： Given a List of words, return the words that can be typed using letters of alphabet on only one row's of American keyboard like the image below. E 阅读全文

摘要：题目： Given a positive integer, output its complement number. The complement strategy is to flip the bits of its binary representation. Note: Example 1: 阅读全文