level专题

Java compiler level does not match the version of the installed Java project facet. map解决方法

右键项目“Properties”,在弹出的“Properties”窗口左侧,单击“Project Facets”,打开“Project Facets”页面。 在页面中的“Java”下拉列表中,选择相应版本就OK了。

[leetcode] 107. Binary Tree Level Order Traversal II

Binary Tree Level Order Traversal II 描述 Given a binary tree, return the bottom-up level order traversal of its nodes’ values. (ie, from left to right, level by level from leaf to root). For example

[leetcode] 102. Binary Tree Level Order Traversal

Binary Tree Level Order Traversal 描述 Given a binary tree, return the level order traversal of its nodes’ values. (ie, from left to right, level by level). For example: Given binary tree [3,9,20

【备考指南】CDA Level Ⅰ 最全备考攻略

很多考生朋友在报名前后,一直不知道需要怎么备考,这里给大家盘点一下最全的备考攻略,希望对你有用: 1、需要准备好之后再报名吗? 不需要,CDA认证考试是报名后自行预约考试的,您可以先报名同时备考,再选择合适的时间考试。 这里分享一个你一定用得到的小程序——CDA考试小程序。 它是专为CDA数据分析认证考试报考打造的一款小程序。可以帮你快速报名考试、查成绩、查证书、查积分,通过该小程序,考生可以

CDA二级(Level II)数据分析师——考试内容梳理四

定额抽样不属于概率抽样 、类型抽样就是分群抽样; 在假设检验中,两类错误的概率相加后不等于1, 在样本量增大的条件下,两类错误的概率可以同时减小, 通常控制第一类错误的概率 ;(去真) 假设检验使用的是反证法,即先提出一个关于总体参数的假设,然后用样本数据来检验这个假设是否可能为真; 在假设检验中,左侧检验为>=,右侧检验为<=,指原假设; 区间估计是使用顺推法,即先不对总体参数提出具体假

车企高管组团“出道”,汽车营销已经Next level了?

汽车进入了“卷”老板、“卷”高管的时代! 谁能想到,雷军凭一己之力,在一定程度上重塑了汽车的竞争策略。价格战之外,车市又开启了流量之战。 云略曾在《雷军20天吸粉500w+!……》一文中,提到继雷军之后,长城汽车董事长魏建军、奇瑞董事长尹同跃等都纷纷入驻抖音开启了直播之路。 老板亲下场后,各车企的高管们也纷纷化身“网红”活跃在社媒平台,试图成为品牌的一大名片。 这不,继小米

Binary Tree Zigzag Level Order Traversal问题及解法

问题描述: Given a binary tree, return the zigzag level order traversal of its nodes' values. (ie, from left to right, then right to left for the next level and alternate between). 示例: Given binary t

Binary Tree Level Order Traversal问题及解法

问题描述: Given a binary tree, return the level order traversal of its nodes' values. (ie, from left to right, level by level). 示例: Given binary tree [3,9,20,null,null,15,7], 3/ \9 20/ \15 7

【PAT】【Advanced Level】1009. Product of Polynomials (25)

1009. Product of Polynomials (25) 时间限制 400 ms 内存限制 65536 kB 代码长度限制 16000 B 判题程序 Standard 作者 CHEN, Yue This time, you are supposed to find A*B where A and B are two pol

【PAT】【Advanced Level】1008. Elevator (20)

1008. Elevator (20) 时间限制 400 ms 内存限制 65536 kB 代码长度限制 16000 B 判题程序 Standard 作者 CHEN, Yue The highest building in our city has only one elevator. A request list is made

【PAT】【Advanced Level】1007. Maximum Subsequence Sum (25)

1007. Maximum Subsequence Sum (25) 时间限制 400 ms 内存限制 65536 kB 代码长度限制 16000 B 判题程序 Standard 作者 CHEN, Yue Given a sequence of K integers { N1, N2, ..., NK }. A continuous

【PAT】【Advanced Level】1006. Sign In and Sign Out (25)

1006. Sign In and Sign Out (25) 时间限制 400 ms 内存限制 65536 kB 代码长度限制 16000 B 判题程序 Standard 作者 CHEN, Yue At the beginning of every day, the first person who signs in the co

【PAT】【Advanced Level】1005. Spell It Right (20)

1005. Spell It Right (20) 时间限制 400 ms 内存限制 65536 kB 代码长度限制 16000 B 判题程序 Standard 作者 CHEN, Yue Given a non-negative integer N, your task is to compute the sum of all the

【PAT】【Advanced Level】1004. Counting Leaves (30)

1004. Counting Leaves (30) 时间限制 400 ms 内存限制 65536 kB 代码长度限制 16000 B 判题程序 Standard 作者 CHEN, Yue A family hierarchy is usually presented by a pedigree tree. Your job is to

【PAT】【Advanced Level】1003. Emergency (25)

1003. Emergency (25) 时间限制 400 ms 内存限制 65536 kB 代码长度限制 16000 B 判题程序 Standard 作者 CHEN, Yue As an emergency rescue team leader of a city, you are given a special map of y

【PAT】【Advanced Level】1002. A+B for Polynomials (25)

1002. A+B for Polynomials (25) 时间限制 400 ms 内存限制 65536 kB 代码长度限制 16000 B 判题程序 Standard 作者 CHEN, Yue This time, you are supposed to find A+B where A and B are two polyn

【PAT】【Advanced Level】1001. A+B Format (20)

1001. A+B Format (20) 时间限制 400 ms 内存限制 65536 kB 代码长度限制 16000 B 判题程序 Standard 作者 CHEN, Yue Calculate a + b and output the sum in standard format -- that is, the digits

【PAT】【Advanced Level】1046. Shortest Distance (20)

1046. Shortest Distance (20) 时间限制 100 ms 内存限制 65536 kB 代码长度限制 16000 B 判题程序 Standard 作者 CHEN, Yue The task is really simple: given N exits on a highway which forms a si

【PAT】【Advanced Level】1045. Favorite Color Stripe (30)

1045. Favorite Color Stripe (30) 时间限制 200 ms 内存限制 65536 kB 代码长度限制 16000 B 判题程序 Standard 作者 CHEN, Yue Eva is trying to make her own color stripe out of a given one. She

【PAT】【Advanced Level】1044. Shopping in Mars (25)

1044. Shopping in Mars (25) 时间限制 100 ms 内存限制 65536 kB

【PAT】【Advanced Level】1043. Is It a Binary Search Tree (25)

1043. Is It a Binary Search Tree (25) 时间限制 400 ms 内存限制 65536 kB 代码长度限制 16000 B 判题程序 Standard 作者 CHEN, Yue A Binary Search Tree (BST) is recursively defined as a binary

【PAT】【Advanced Level】1042. Shuffling Machine (20)

1042. Shuffling Machine (20) 时间限制 400 ms 内存限制 65536 kB 代码长度限制 16000 B 判题程序 Standard 作者 CHEN, Yue Shuffling is a procedure used to randomize a deck of playing cards. Be

【PAT】【Advanced Level】1040. Longest Symmetric String (25)

1040. Longest Symmetric String (25) 时间限制 400 ms 内存限制 65536 kB 代码长度限制 16000 B 判题程序 Standard 作者 CHEN, Yue Given a string, you are supposed to output the length of the lo

【PAT】【Advanced Level】1039. Course List for Student (25)

1039. Course List for Student (25) 时间限制 200 ms 内存限制 65536 kB 代码长度限制 16000 B 判题程序 Standard 作者 CHEN, Yue Zhejiang University has 40000 students and provides 2500 courses

【PAT】【Advanced Level】1038. Recover the Smallest Number (30)

1038. Recover the Smallest Number (30) 时间限制 400 ms 内存限制 65536 kB 代码长度限制 16000 B 判题程序 Standard 作者 CHEN, Yue Given a collection of number segments, you are supposed to r