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RSS订阅原创 leetcode 825. Friends Of Appropriate Ages
leetcode 825. Friends Of Appropriate Ages原题地址：https://leetcode.com/problems/friends-of-appropriate-ages/题目Some people will make friend requests. The list of their ages is given and ages[i] is ...
2018-05-02 19:56:41
727
原创 leetcode 824. Goat Latin
leetcode 824. Goat Latin原题地址：https://leetcode.com/problems/goat-latin/题目A sentence S is given, composed of words separated by spaces. Each word consists of lowercase and uppercase letters on...
2018-05-02 19:50:04
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转载 NMS—非极大值抑制
NMS——非极大值抑制 转载自： https://blog.youkuaiyun.com/shuzfan/article/details/52711706 NMS（non maximum suppression），中文名非极大值抑制，在很多计算机视觉任务中都有广泛应用，如：边缘检测、目标检测等。 这里主要以人脸检测中的应用为例，来说明NMS...
2018-04-23 21:13:02
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原创 leetcode 823. Binary Trees With Factors
leetcode 823. Binary Trees With Factors原题地址：https://leetcode.com/problems/binary-trees-with-factors/题目Given an array of unique integers, each integer is strictly greater than 1.We make a b...
2018-04-22 18:20:51
462
原创 leetcode 822. Card Flipping Game
leetcode 822. Card Flipping Game原题地址：https://leetcode.com/problems/card-flipping-game/题目On a table are N cards, with a positive integer printed on the front and back of each card (possibly d...
2018-04-22 18:15:58
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原创 leetcode 821. Shortest Distance to a Character
leetcode 821. Shortest Distance to a Character原题地址：https://leetcode.com/problems/shortest-distance-to-a-character/题目Given a string S and a character C, return an array of integers representing...
2018-04-22 18:08:59
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原创 leetcode 820. Short Encoding of Words
leetcode 820. Short Encoding of Words原题地址：https://leetcode.com/problems/short-encoding-of-words/题目Given a list of words, we may encode it by writing a reference string S and a list of indexe...
2018-04-22 18:05:36
673
原创 leetcode 818. Race Car
leetcode 818. Race Car原题地址：https://leetcode.com/problems/race-car/题目Your car starts at position 0 and speed +1 on an infinite number line. (Your car can go into negative positions.)Your c...
2018-04-16 11:05:30
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原创 leetcode 819. Most Common Word
leetcode 819. Most Common Word原题地址：https://leetcode.com/problems/most-common-word/题目Given a paragraph and a list of banned words, return the most frequent word that is not in the list of ban...
2018-04-15 22:06:42
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原创 leetcode 817. Linked List Components
leetcode 817. Linked List Components原题地址：https://leetcode.com/problems/linked-list-components/题目We are given head, the head node of a linked list containing unique integer values.We are al...
2018-04-15 22:02:45
600
原创 leetcode 816. Ambiguous Coordinates
leetcode 816. Ambiguous Coordinates原题地址：https://leetcode.com/problems/ambiguous-coordinates/题目We had some 2-dimensional coordinates, like “(1, 3)” or “(2, 0.5)”. Then, we removed all commas...
2018-04-15 21:58:28
460
原创 leetcode 815. Bus Routes
leetcode 815. Bus Routes原题地址：https://leetcode.com/problems/bus-routes/ 代码转载自：https://leetcode.com/problems/bus-routes/discuss/122723/Python-Simple-BFS题目We have a list of bus routes. Each ro...
2018-04-08 12:14:21
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原创 leetcode 813. Largest Sum of Averages
leetcode 813. Largest Sum of Averages原题地址：https://leetcode.com/problems/largest-sum-of-averages/题目We partition a row of numbers A into at most K adjacent (non-empty) groups, then our score i...
2018-04-08 12:01:19
735
原创 leetcode 814. Binary Tree Pruning
leetcode 814. Binary Tree Pruning原题地址：https://leetcode.com/problems/binary-tree-pruning/题目We are given the head node root of a binary tree, where additionally every node’s value is either a ...
2018-04-08 11:57:32
290
原创 leetcode 812. Largest Triangle Area
leetcode 812. Largest Triangle Area原题地址：https://leetcode.com/problems/largest-triangle-area/题目You have a list of points in the plane. Return the area of the largest triangle that can be form...
2018-04-08 11:48:39
425
原创 leetcode 810. Chalkboard XOR Game
leetcode 810. Chalkboard XOR Game原题地址：https://leetcode.com/problems/chalkboard-xor-game/题目We are given non-negative integers nums[i] which are written on a chalkboard. Alice and Bob take tu...
2018-04-01 20:04:15
630
原创 leetcode 808. Soup Servings
leetcode 808. Soup Servings原题地址：https://leetcode.com/problems/soup-servings/题目There are two types of soup: type A and type B. Initially we have N ml of each type of soup. There are four kin...
2018-04-01 18:49:02
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原创 leetcode 809. Expressive Words
leetcode 809. Expressive Words原题地址：https://leetcode.com/problems/expressive-words/题目Sometimes people repeat letters to represent extra feeling, such as “hello” -> “heeellooo”, “hi” ->...
2018-04-01 18:43:30
596
原创 leetcode 811. Subdomain Visit Count
leetcode 811. Subdomain Visit Count原题地址：https://leetcode.com/problems/subdomain-visit-count/题目A website domain like “discuss.leetcode.com” consists of various subdomains. At the top level, ...
2018-04-01 18:39:05
573
原创 2018北邮计算机院机试真题
2018北邮计算机院机试真题（回忆版，答案仅供参考）根据刚机试结束的同学回忆，今年北邮机试题目下，并附上本人解答。（应该有一些细节没考虑，如果发现问题，欢迎留言指正交流） 大神就当看个笑话 =。=Problem A题目:输入数据0-2的32次方范围，化成二进制，然后逆序这个二进制序列，转换成十进制。测试数据：2输出：1测试数据：10 输出...
2018-03-31 00:58:59
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原创 2018北邮网研院机试真题
2018北邮网研院机试真题（答案仅供参考）根据刚机试结束的同学回忆，今年北邮机试题目下，并附上本人解答。（应该有一些细节没考虑，如果发现问题，欢迎留言指正交流） 大神就当看个笑话 =。=Problem A题目: 类似超市结账，计算购买的商品的总价格。输入：第一行为测试数据组数T(0< T <= 10) 每组数据第一行为购买商品的种类n，接下来n行...
2018-03-29 21:05:00
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转载 两句话掌握python最难知识点——元类
两句话掌握python最难知识点——元类转载自: https://segmentfault.com/a/1190000011447445 文章写得比较生动，点赞。千万不要被所谓“元类是99%的python程序员不会用到的特性”这类的说辞吓住。因为每个中国人，都是天生的元类使用者学懂元类，你只需要知道两句话：道生一，一生二，二生三，三生万物。我是谁？我从哪来里？我要到哪里去？...
2018-03-28 15:20:54
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原创 数学工具--母函数
数学工具—母函数母函数也叫生成函数，是组合数学中尤其是计数方面的一个重要理论和工具。生成函数有普通型生成函数和指数型生成函数两种，其中普通型用的比较多。形式上说，普通型生成函数用于解决多重集的组合问题，而指数型母函数用于解决多重集的排列问题。母函数还可以解决递归数列的通项问题（例如使用母函数解决斐波那契数列的通项公式）。定义(1).设u=(ui)i≥0=(u0,u1,u2,…,...
2018-03-26 23:46:48
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原创 leetcode805. Split Array With Same Average
leetcode805. Split Array With Same Average原题地址：https://leetcode.com/problems/split-array-with-same-average/题目In a given integer array A, we must move every element of A to either list B or l...
2018-03-25 21:22:04
536
原创 leetcode807.Max Increase to Keep City Skyline
leetcode807. Max Increase to Keep City Skyline原题地址：https://leetcode.com/problems/max-increase-to-keep-city-skyline/题目In a 2 dimensional array grid, each value grid[i][j] represents the height ...
2018-03-25 20:15:21
258
原创 leetcode806. Number of Lines To Write String
leetcode806. Number of Lines To Write String（python)原题地址：https://leetcode.com/problems/number-of-lines-to-write-string/题目We are to write the letters of a given string S, from left to right int...
2018-03-25 20:14:35
276
原创 leetcode804. Unique Morse Code Words
leetcode804. Unique Morse Code Words（python)原题地址：https://leetcode.com/problems/unique-morse-code-words/题目International Morse Code defines a standard encoding where each letter is mapped to a...
2018-03-25 20:13:36
369
转载 Caffe学习：Layers
Caffe学习：Layers转载自：https://blog.youkuaiyun.com/u011762313/article/details/47361571 目录：Caffe学习：LayersVision LayersConvolutionPoolingLocal Response Normalizatio...
2018-03-23 11:27:03
174
转载 卷积神经网络概念与原理
卷积神经网络概念与原理 一、卷积神经网络的基本概念转载自：http://blog.youkuaiyun.com/yunpiao123456/article/details/52437794 受Hubel和Wiesel对猫视觉皮层电生理研究启发，有人提出卷积神经网络（CNN），Yann Lecun 最早将CNN用于手写数字...
2018-03-22 10:15:04
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原创 leetcode803. Bricks Falling When Hit(python)
803. Bricks Falling When Hit(python)原题地址：https://leetcode.com/problems/bricks-falling-when-hit/摘自leetcode 用户：cthbst题目We have a grid of 1s and 0s; the 1s in a cell represent bricks. A bri...
2018-03-18 19:07:07
678
原创 leetcode802. Find Eventual Safe States(python)
leetcode802. Find Eventual Safe States(python)原题地址：https://leetcode.com/problems/find-eventual-safe-states/题目In a directed graph, we start at some node and every turn, walk along a directed ed...
2018-03-18 14:35:36
492
原创 leetcode801. Minimum Swaps To Make Sequences Increasing(python)
leetcode801. Minimum Swaps To Make Sequences Increasing(python)原题地址：https://leetcode.com/problems/minimum-swaps-to-make-sequences-increasing/题目We have two integer sequences A and B of the same...
2018-03-18 14:31:18
900
原创 leetcode800. Similar RGB Color(python)
leetcode800. Similar RGB Color(python)原题地址：题目In the following, every capital letter represents some hexadecimal digit from 0 to f.The red-green-blue color “#AABBCC” can be written as “#ABC...
2018-03-18 14:27:25
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原创 计算PI(π)的几种方法
计算π的方法一、蒙特卡罗法这种方法是一种利用计算机随机数的功能基于“随机数”的算法，通过计算落在单位圆内的点与落在正方形内的 点的比值求PI。 由于图形的对称性，我们靠考虑该图的四分之一部分。 假定一点能够均匀地扔到一个正方形中，计算落入其中的点个数。通过计数其中落入内切圆的点的个数； 如果一共投入N个点，其中有M个落入圆中，则只要点均匀，假定圆周的半径为R，则： M...
2018-03-13 21:15:23
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原创 Strassen矩阵乘法
Strassen矩阵乘法矩阵乘法是线性代数中最常见的运算之一，它在数值计算中有广泛的应用。 给定两个的矩阵A和B，求它们的积 C = A × B 算法: cij=∑kaikbkjcij=∑kaikbkj c_{ij} = \sum_k a_{ik}b_{kj} 直接相乘做累加，需要做N3N3N^3 乘法,复杂度为O(N3O(N3O(N^3)。假设有以下矩阵等式：[C...
2018-03-13 20:16:45
753
原创 leetcode799. Champagne Tower(python3)
leetcode799. Champagne Tower(python3)原题地址：https://leetcode.com/problems/champagne-tower/题目We stack glasses in a pyramid, where the first row has 1 glass, the second row has 2 glasses, and so...
2018-03-11 19:08:33
680
原创 leetcode 798. Smallest Rotation with Highest Score(java)
leetcode798. Smallest Rotation with Highest Score(java)原题地址：https://leetcode.com/problems/smallest-rotation-with-highest-score/题目Given an array A, we may rotate it by a non-negative integer...
2018-03-11 18:57:42
727
原创 leetcode 797. All Paths From Source to Target(python3)
leetcode 797. All Paths From Source to Target(python3)原题地址：https://leetcode.com/problems/all-paths-from-source-to-target/题目Given a directed, acyclic graph of N nodes. Find all possible pat...
2018-03-11 18:08:46
596
原创 leetcode 796.Rotate String(python3)
leetcode 796.Rotate String(python3)原题地址：https://leetcode.com/problems/rotate-string/题目We are given two strings, A and B.A shift on A consists of taking string A and moving the leftmost ch...
2018-03-11 17:58:04
626
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