让勤奋成为习惯

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, YueThe highest building in our city has only one ele

1027. Colors in Mars (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, YuePeople in Mars represent the colors in thei

1035. Password (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, YueTo prepare for PAT, the judge sometimes has to ge

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, YueAt the beginning of every day, the

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, YueThis time, you are supposed to find

题目描述问题描述：给出4个1-10的数字，通过加减乘除，得到数字为24就算胜利 输入： 4个1-10的数字。[数字允许重复，测试用例保证无异常数字] 输出： true or false输入描述: 输入4个int整数 输出描述: 返回能否得到24点，能输出true，不能输出false 输入例子: 7 2 1 10输出例子: trueimport java.util.Ar

[这个问题之前面试中有问到过，还是值得学习下的~]3. Longest Substring Without Repeating CharactersGiven a string, find the length of the longest substring without repeating characters.Examples:Given “abcabcbb”, the answer is

4. Median of Two Sorted ArraysThere are two sorted arrays nums1 and nums2 of size m and n respectively. Find the median of the two sorted arrays. The overall run time complexity should be O(log (m+n)).

5. Longest Palindromic SubstringGiven a string S, find the longest palindromic substring in S. You may assume that the maximum length of S is 1000, and there exists one unique longest palindromic subst

题目： The string “PAYPALISHIRING” is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a fixed font for better legibility) P A H N A

题目： Reverse digits of an integer. Example1: x = 123, return 321 Example2: x = -123, return -321题目意思很简单，但是需要考虑溢出。 尝试了字符串的解法和纯int数字解，发现后者效率更高，那么笔者是如何判断是否溢出的呢？比如1234567899，正序不溢出，逆序溢出。 做法：先判断位数，

1081. Rational Sum (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, YueGiven N rational numbers in the form "numerat

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, YueGiven a sequence of K integers { N

1011. World Cup Betting (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, YueWith the 2010 FIFA World Cup running, fo

1012. The Best Rank (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, YueTo evaluate the performance of our first yea

1013. Battle Over Cities (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, YueIt is vitally important to have all the

1014. Waiting in Line (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, YueSuppose a bank has N windows open for serv

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, YueGiven a non-negative integer N, your task i

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, YueA family hierarchy is usually presented by a

1031. Hello World for U (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, YueGiven any string of N (>=5) characters,

1015. Reversible Primes (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, YueA reversible prime in any number system

题目链接：http://www.patest.cn/contests/pat-a-practise/10031003. 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, Y

1023. Have Fun with Numbers (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, YueNotice that the number 123456789 is

Implement atoi to convert a string to an integer. Hint: Carefully consider all possible input cases. If you want a challenge, please do not see below and ask yourself what are the possible input cas