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第一题： A. Olympiad time limit per test 1 second memory limit per test 256 megabytes input standard input output standard outputThe recent All-Berland Olympiad in Informatics featured n partic...

题目链接：http://codeforces.com/contest/810/problem/C题目大意： 告诉你一个含有n个互不相同的元素的集合，求它的所有非空子集中元素最大值与元素最小值之差的和。结果很大，输出它%1e9+7后的结果。推倒： 先对A排序，然后不妨枚举子集的最小元素，看一下它对答案的贡献考虑一个数列1 3 5 7 9，假设1是子集的最小元素再考虑集合的最大元素...

codeforces 615A. BulbsA. Bulbs time limit per test 1 second memory limit per test 256 megabytes input standard input output standard outputVasya wants to turn on Christmas lights consistin...

B. New Year and North Pole time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard outputIn this problem we assume the Earth to be a completely...

A. New Year and Hurry time limit per test 1 second memory limit per test 256 megabytes input standard input output standard outputLimak is going to participate in a contest on the last day o...

A. Santa Claus and Candies time limit per test 1 second memory limit per test 256 megabytes input standard input output standard outputSanta Claus has n candies, he dreams to give them as gi...

A. Crazy Computer time limit per test2 seconds memory limit per test256 megabytes inputstandard input outputstandard output ZS the Coder is coding on a crazy computer. If you don’t type in a word...

A. Buy a Shovel time limit per test 1 second memory limit per test 256 megabytes input standard input output standard outputPolycarp urgently needs a shovel! He comes to the shop and chooses...

题目：A. Restoring NumbersPavel had two positive integers a and b. He found their sum s and greatest common divisor g, and forgot a and b after that. Help him to restore the original numbers.InputA ...