脂环

摘要： Bob has given Alice a necklace as her birthday gift. That necklace has 𝑁N crystals, 𝑀M of which catches her fancy. Formally, crystals with labels of 阅读全文

摘要： Once there was a rooted tree. The tree contained n nodes, which were numbered 1,…,n. The node numbered 1 was the root of the tree. Besides, every node 阅读全文

摘要： Once there was a mathematician, who was obsessed with meaningless number sequences. Here is one of them. 𝑎𝑛={1,𝑐⋅max0≤𝑖<𝑛𝑎𝑛&𝑖,𝑛=0otherwise,an 阅读全文

摘要： 507. Treediff Time limit per test: 0.25 second(s) Memory limit: 262144 kilobytes input: standard output: standard Andrew has just made a breakthrough 阅读全文

摘要： You are given a rooted tree with root in vertex 1. Each vertex is coloured in some colour. Let's call colour c dominating in the subtree of vertex v i 阅读全文

摘要： Grammy is playing a game with her roommate Alice on a sequence 𝐴A with 𝑛n non-negative integers 𝐴1,𝐴2,…,𝐴𝑛A1,A2,…,An. The rules of the game are 阅读全文

摘要： After the last network breakdown, you've been assigned to redesign the signal transmission network of ICPC (Internet Clogging Prevention Corporation)! 阅读全文

摘要： An integer sequence with length 𝑛n, denoted by 𝑎1,𝑎2,⋯,𝑎𝑛a1,a2,⋯,an, is generated randomly, and the probability of being 1,2,⋯,𝑛1,2,⋯,n are all 阅读全文

摘要： The robot is located on a checkered rectangular board of size 𝑛×𝑚n×m (𝑛n rows, 𝑚m columns). The rows in the board are numbered from 11 to 𝑛n from 阅读全文

摘要： A. Era 维护一个新数组的末尾位置变量pos，遍历的时候不断更新即可。 #include <iostream> #include <vector> #include <algorithm> #include <cstring> #include <map> #include <set> #def 阅读全文