2 problems for div3 participants Bomb Defusing II Statement Find how many years in range [l,r] that it has Sept.1 as a weekend(Sunday and Saturday)? Example l=2017,r=2019 out=2 2018/9/1 is Saturday while 2019/9/1 is Sunday Constriants (Div2A-Div2B)……

思考题 within 5 min Bomb defusing 「Readers, please set up a 5-minute timer before you continue to read」 Green boy envied Orange Boy for having such a high rating. So he decided to send Orange Boy a present: a bomb! The bomb will explode in 5 minu……

APPROXIMATE PROBLEM WARNING Metro There are N metro stations in a city. The distance between each two station is a fixed integer x. Your task is to construct some metro lines across the stations. We define a cost from station A to station B as the ……

思考题 for bread Bread Story You have a piece of bread which can be seen as a N*M grid. You also have a bottle of jam. You want to put some jam on the bread to make the bread delicious. You can do the following two operations: Put 1 unit of jam on……

APPROXIMATE PROBLEM WARNING Graph There is a grid of size N*M. Each grid could be "#" or ".". You need to find the shortest path from (1,1) to (N,M) by walking on "." only. But you are NOT given the graph. You can only see the grids near you. That ……

「考える問題は簡単ですか」 Programming Detect You are given a directed graph G with N nodes and M edges. Each node has an operation, which could be "def sth" or "use sth". An array of nodes A is called Exceptional iff: - for each 1\leq i\leq |A|-1 ……

野兽成分更多的思考题 广西省人大音乐II 不支持audio！！ Electric Heritage Haniyasushin Keiki loves crafting. She has n kinds of items. The i-th kind of item has name name_i. She also has m recipes. The i-th recipe needs len_i of different kinds of di……

比以往更加黑暗的思考题 广西省人大音乐 不支持audio！！ Idolatrize World Haniyasushin Keiki loves crafting. She has n kinds of items. The i-th kind of item has name name_i. She also has m recipes. The i-th recipe needs len_i of different kinds of dif……

思考题 about poems Is your love as confusing as the sun acquiesced? Once a Chinese poem said: There's sun in the east but rain in the west, Is your love as confusing as the sun acquiesced? Now you are given a undirected weighted graph G of N ……

思考题 for Hakurei Reimu Legacy of Lunatic Kingdom ZJS loves playing Touhou. In the famous STG game Touhou:Legacy of Lunatic Kingdom the game rules are defined as follows: The game consists of N "stages". Player start from Stage 1 and ends at Stage……