DeaL0124

摘要： Lily is fascinated by numbers. She believes the whole world revolves around them, and that everything is connected by numbers. Her friends, Alice, Bob 阅读全文

摘要： Denis, after buying flowers and sweets (you will learn about this story in the next task), went to a date with Nastya to ask her to become a couple. N 阅读全文

摘要： Hilbert's Hotel is a very unusual hotel since the number of rooms is infinite! In fact, there is exactly one room for every integer, including zero an 阅读全文

摘要： You are given two integers aa and bb, and qq queries. The ii-th query consists of two numbers lili and riri, and the answer to it is the number of int 阅读全文

摘要： Phoenix has a string ss consisting of lowercase Latin letters. He wants to distribute all the letters of his string into kk non-empty strings a1,a2,…, 阅读全文

摘要： Santa Claus has received letters from nn different kids throughout this year. Of course, each kid wants to get some presents from Santa: in particular 阅读全文

摘要： We start with a string ss consisting only of the digits 11, 22, or 33. The length of ss is denoted by |s||s|. For each ii from 11 to |s||s|, the ii-th 阅读全文

摘要： Your friend Jeff Zebos has been trying to run his new online company, but it's not going very well. He's not getting a lot of sales on his website whi 阅读全文

摘要： This is the hard version of this problem. The only difference is the constraint on kk — the number of gifts in the offer. In this version: 2≤k≤n2≤k≤n. 阅读全文

摘要： Recall that the permutation is an array consisting of nn distinct integers from 11 to nn in arbitrary order. For example, [2,3,1,5,4][2,3,1,5,4] is a 阅读全文