柳下桃蹊

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

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

Pak Chanek has n blank heart-shaped cards. Card 11 is attached directly to the wall while each of th

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

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

Little Sasha has two friends, whom he wants to please with gifts on the Eighth of March. To do this,

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

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

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 length N consist