柳下桃蹊

Given a string S consists of lower case letters. You're going to perform Q operations ...

D Recently, Jvruo​ became obsessed with a fighting game. In this game, n​ characters s...

B Fibonacci Sequence: f0=1 f1=1 fi=fi−1+fi−2,i≥2 Fibonacci representation F(x): Any na...

Problem Description During the War of Resistance Against Japan, tunnel warfare was car...

F A snowflake graph is generated from two integers x and y, both greater than 1, as fo...

C. Dreaming of Freedom time limit per test 2.5 seconds memory limit per test 256 megab...

一棵树上有n个节点，编号分别为1到n，每个节点都有一个权值w。我们将以下面的形式来要求你对这棵树完成一些操作： CHANGE u t，把结点u的权值改为t。 QMAX u ...

树链剖分 原理 树链剖分是根据轻重儿子，将一棵树剖成多条链，然后就可以用数据结构来维护这些链了，听着似乎还是有点像暴力，不过因为一条链有多个结点，所以可以优化时间复杂度。 ...

C Princess Celestia, is an Alicorn pony, the former co-ruler of Equestria alongside he...

Gold Rong 有一个长度为 n 的数组，下标从 1 开始。刚开始所有元素都是 0 。 Gold Rong 现在要对数组进行 q 次修改，每次修改时 Gold Rong...

This is an interactive problem. Initially, there is an array a=[1,2,…,n], where n is a...

Given an unrooted tree, you should choose the minimum number of chains that all edges ...

Pak Chanek has n blank heart-shaped cards. Card 11 is attached directly to the wall wh...

A positive number x of length n in base p (2≤p≤109) is written on the blackboard. The ...

You are given a rooted tree consisting of n vertices numbered from 1 to n. The root of...

Little Sasha has two friends, whom he wants to please with gifts on the Eighth of Marc...

You are given two arrays: an array a consisting of n zeros and an array b consisting o...

You are given a tree (a connected graph without cycles) with n vertices. Consider a fi...

打一半说不计分了，刚好天梯赛打完就不想写了，后面不先把写过的写个题解把 Problem Statement A You are given a string S of le...

B. Meeting on the Line n people live on the coordinate line, the i-th one lives at the...