04 2019 档案

LeetCode 70. Climbing Stairs爬楼梯 (C++)
摘要：题目： You are climbing a stair case. It takes n steps to reach to the top. Each time you can either climb 1 or 2 steps. In how many distinct ways can yo 阅读全文
posted @ 2019-04-23 23:55 silentteller 阅读(484) 评论(0) 推荐(0)
LeetCode 141. Linked List Cycle环形链表 (C++)
摘要：题目： Given a linked list, determine if it has a cycle in it. To represent a cycle in the given linked list, we use an integer pos which represents the 阅读全文
posted @ 2019-04-22 23:43 silentteller 阅读(293) 评论(0) 推荐(0)
LeetCode 606. Construct String from Binary Tree根据二叉树创建字符串 (C++)
摘要：题目： You need to construct a string consists of parenthesis and integers from a binary tree with the preorder traversing way. The null node needs to be 阅读全文
posted @ 2019-04-22 00:05 silentteller 阅读(218) 评论(0) 推荐(0)
LeetCode 633. Sum of Square Numbers平方数之和 (C++)
摘要：题目： Given a non-negative integer c, your task is to decide whether there're two integers a and b such that a2 + b2 = c. Example 1: Example 2: 分析： 给定一个 阅读全文
posted @ 2019-04-21 23:52 silentteller 阅读(269) 评论(0) 推荐(0)
LeetCode 617. Merge Two Binary Trees合并二叉树 (C++)
摘要：题目： Given two binary trees and imagine that when you put one of them to cover the other, some nodes of the two trees are overlapped while the others a 阅读全文
posted @ 2019-04-21 23:24 silentteller 阅读(276) 评论(0) 推荐(0)
LeetCode 628. Maximum Product of Three Numbers三个数的最大乘积 (C++)
摘要：题目： Given an integer array, find three numbers whose product is maximum and output the maximum product. Example 1: Example 2: 分析： 给定一个数组，返回其中三个元素乘积的最大 阅读全文
posted @ 2019-04-21 00:55 silentteller 阅读(324) 评论(0) 推荐(0)
LeetCode 637. Average of Levels in Binary Tree二叉树的层平均值 (C++)
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: Note: 分析： 题目很好理解，就是求二叉树每一层的 阅读全文
posted @ 2019-04-21 00:12 silentteller 阅读(227) 评论(0) 推荐(0)
LeetCode 463. Island Perimeter岛屿的周长 (C++)
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
posted @ 2019-04-21 00:01 silentteller 阅读(301) 评论(0) 推荐(0)
LeetCode 504. Base 7 (C++)
摘要：题目： Given an integer, return its base 7 string representation. Example 1: Example 2: Note: The input will be in range of [-1e7, 1e7]. 分析： 给定一个7进制数，求十进 阅读全文
posted @ 2019-04-18 00:09 silentteller 阅读(231) 评论(0) 推荐(0)
LeetCode 551. Student Attendance Record I (C++)
摘要：题目： You are given a string representing an attendance record for a student. The record only contains the following three characters: A student could b 阅读全文
posted @ 2019-04-18 00:00 silentteller 阅读(240) 评论(0) 推荐(0)
LeetCode 303. Range Sum Query - Immutable (C++)
摘要：题目： Given an integer array nums, find the sum of the elements between indices iand j (i ≤ j), inclusive. Example: Note: 分析： 题目的意思很简单，给定一个数组，使用sumRange 阅读全文
posted @ 2019-04-17 00:31 silentteller 阅读(223) 评论(0) 推荐(0)
LeetCode 655. Print Binary Tree (C++)
摘要：题目： Print a binary tree in an m*n 2D string array following these rules: Example 1: Example 2: Example 3: Note: The height of binary tree is in the ra 阅读全文
posted @ 2019-04-16 23:59 silentteller 阅读(498) 评论(0) 推荐(0)
LeetCode 561. Array Partition I (C++)
摘要：题目： Given an array of 2n integers, your task is to group these integers into npairs of integer, say (a1, b1), (a2, b2), ..., (an, bn) which makes sum 阅读全文
posted @ 2019-04-15 00:19 silentteller 阅读(173) 评论(0) 推荐(0)
LeetCode 566. Reshape the Matrix (C++)
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
posted @ 2019-04-14 23:27 silentteller 阅读(208) 评论(0) 推荐(0)
LeetCode 174. Dungeon Game (C++)
摘要：题目： The demons had captured the princess (P) and imprisoned her in the bottom-right corner of a dungeon. The dungeon consists of M x N rooms laid out 阅读全文
posted @ 2019-04-14 16:36 silentteller 阅读(231) 评论(0) 推荐(0)
LeetCode 404. Sum of Left Leaves (C++)
摘要：题目： Find the sum of all left leaves in a given binary tree. Example: 分析： 给定一颗二叉树，求左叶子节点的和。 重点在于如何判断左叶子节点，如果一个节点的left存在，且left的left和right都为空，那么我们就可以将这个节 阅读全文
posted @ 2019-04-14 15:51 silentteller 阅读(131) 评论(0) 推荐(0)
LeetCode 455. Assign Cookies (C++)
摘要：题目： Assume you are an awesome parent and want to give your children some cookies. But, you should give each child at most one cookie. Each child i has 阅读全文
posted @ 2019-04-14 15:38 silentteller 阅读(255) 评论(0) 推荐(0)
LeetCode 461. Hamming Distance (C++)
摘要：题目： The Hamming distance between two integers is the number of positions at which the corresponding bits are different. Given two integers x and y, ca 阅读全文
posted @ 2019-04-14 15:22 silentteller 阅读(298) 评论(0) 推荐(0)
LeetCode 657. Robot Return to Origin (C++)
摘要：题目： There is a robot starting at position (0, 0), the origin, on a 2D plane. Given a sequence of its moves, judge if this robot ends up at (0, 0) afte 阅读全文
posted @ 2019-04-11 01:07 silentteller 阅读(274) 评论(0) 推荐(0)
LeetCode 1. Two Sum (C++)
摘要：题目： Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input would hav 阅读全文
posted @ 2019-04-11 00:59 silentteller 阅读(198) 评论(0) 推荐(0)