题目链接:http://codeforces.com/gym/100989/problem/L / http://codeforces.com/gym/100989/problem/M 题目大意:给定一个具有N项的表达式,求出最少修改符号次数使得表达式的和为0. 题目分析: 1.两道题的题意一模一样,区别在于数据范围不同.L题N的范围在20以内,但是表达式中每一项的值范围在 1e9 之内.M题的N范围在300之内,每一项的值范围在300之内. 2.所以L题用枚举,枚举每一种修改的情况取最少修改次…

B Although Haneen was able to solve the LCS problem, Dr. Ibrahim is suspicious about whether she really understands the LCS problem or not. He believes that she can't write the code on her own, but can only translate the LCS pseudo-code given in clas…

题目链接:http://codeforces.com/gym/100989/problem/D In this cafeteria, the N tables are all ordered in one line, where table number 1 is the closest to the window and table number N is the closest to the door. Each time a group of X people enter the cafe…

http://codeforces.com/gym/100989/my B. LCS (B) time limit per test 0.25 seconds memory limit per test 256 megabytes input standard input output standard output Although Haneen was able to solve the LCS problem, Dr. Ibrahim is suspicious about whether…

http://codeforces.com/gym/100989/problem/L L. Plus or Minus (A) time limit per test 1.0 s memory limit per test 256 MB input standard input output standard output AbdelKader enjoys math. He feels very frustrated whenever he sees an incorrect equation…

http://codeforces.com/gym/100989/problem/H After the data structures exam, students lined up in the cafeteria to have a drink and chat about how much they have enjoyed the exam and how good their professors are. Since it was late in the evening, the…

 Gym 101047M Removing coins in Kem Kadrãn Time Limit:2000MS     Memory Limit:65536KB     64bit IO Format:%I64d & %I64u Practice Description standard input/output Andréh and his friend Andréas are board-game aficionados. They know many of their friend…

 Gym 101047K Training with Phuket's larvae Time Limit:2000MS     Memory Limit:65536KB     64bit IO Format:%I64d & %I64u Practice Description standard input/output Thai cuisine is known for combining seasonings so that every dish has flavors that are…

Gym 101047E Escape from Ayutthaya Time Limit:2000MS     Memory Limit:65536KB     64bit IO Format:%I64d & %I64u  Practice  Description standard input/output Ayutthaya was one of the first kingdoms in Thailand, spanning since its foundation in 1350 to…

 Gym 101047B  Renzo and the palindromic decoration Time Limit:2000MS     Memory Limit:65536KB     64bit IO Format:%I64d & %I64u Practice Description standard input/output At the ruins of Wat Phra Si Sanphet (วดพระศรสรรเพชญ), one can find famous inscr…