洛谷创办于2013年，致力于为参加noip、noi、acm的选手提供清爽、快捷的编程体验。它拥有在线测题系统、强大的社区、在线学习功能。很多教程内容由各位oiers提供的，内容广泛。无论是 …

You are given a sequence a a , consisting of n n integers, where the i i -th element of the sequence is equal to a_i ai . You are also given two integers x x and y y ( x \le y x ≤ y ). A pair …

整数 N N と素数 P P が与えられます。 1 1 から N N までの番号がついた N N 頂点の連結無向グラフであって以下の条件を満たすものの個数を P P で割った余りを求めてください。 G G …

If it was so, then let's make it a deal... — MayDay, Gentleness Even after copying the paintings from famous artists for ten years, unfortunately, Eric is still unable to become a skillful …

In the upcoming year, there will be many team olympiads, so the teachers of "T-generation" need to assemble a team of three pupils to participate in them. Any three pupils will show a worthy …

Kevin discovered a binary string s s that starts with 1 in the river at Moonlit River Park and handed it over to you. Your task is to select two non-empty substrings ^ {\text {∗}} ∗ of s s (which can …

Luogu is a platform for solving algorithmic problems and improving coding skills.

ICPC（Interactive Clever Pig Contest，交互聪明猪猪大赛）和 CCPC（Classic Clever Pig Contest，经典聪明猪猪大赛）是两个国际知名猪猪竞赛。其中，ICPC 自猪历 a a 年起举办（ …

2024年8月17日 · Luogu 优化插件 前言 截止目前，还有很多谷民正在使用着功能十分之少的原生态Luogu。就算知道一些Luogu优化插件，但是也不知道怎么使用。所以，本蒟蒻向大家推荐几 …

Given a sequence of positive integers, a positive integer is called a mode of the sequence if it occurs the maximum number of times that any positive integer occurs. For example, the mode …