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链接：https://ac.nowcoder.com/acm/contest/321/J来源：牛客网 众所周知,八意永琳擅长制作药物.今天八意永琳又制作了很多份药物,但是由于材料组成的不同,最终的品级也会不同已知八意永琳制作的药物中,一共有n种不同的主材料,用1...n编号,每种主材料有ai种产地,每种产地都有自己的品级.每种主材料只取某个产地的一份,最终该药物的品级为所有主材料的...

You are playing a game of Jongmah. You don't need to know the rules to solve this problem. You have nntiles in your hand. Each tile has an integer between 11 and mm written on it.To win the game, yo...

Summer is coming! It's time for Iahub and Iahubina to work out, as they both want to look hot at the beach. The gym where they go is a matrixawithnlines andmcolumns. Let numbera[i][j]represent...

Peter decided to wish happy birthday to his friend from Australia and send him a card. To make his present more mysterious, he decided to make achain. Chain here is such a sequence of envelopesA = {...

Recently, the bear started studying data structures and faced the following problem.You are given a sequence of integersx1, x2, ..., xnof lengthnandmqueries, each of them is characterized by t...

One day, little Vasya found himself in a maze consisting of(n + 1)rooms, numbered from1to(n + 1). Initially, Vasya is at the first room and to get out of the maze, he needs to get to the(n + 1)-...

You've got ann × mpixel picture. Each pixel can be white or black. Your task is to change the colors of as few pixels as possible to obtain a barcode picture.A picture is a barcode if the followin...

Atreeis a connected graph that doesn't contain any cycles.Thedistancebetween two vertices of a tree is the length (in edges) of the shortest path between these vertices.You are given a tree wi...

题目链接:http://codeforces.com/problemset/problem/1106/ELunar New Year is approaching, and Bob is going to receive some red envelopes with countless money!But collecting money from red envelopes is a t...