思考题 which is obvious Deja Vu There is a ball located at the origin point of a n-dimensional space. Its speed can be seen as a vector of n integers. Its acceleration can be seen as a vector of n integers too. Every second, an event will happen, a……

思考题 for implementing CPP Program You are given a C++ Program without any compiler command (without '#'). It's made sure it will pass compilation when tested on Codeforces C++ 11 compiler after adding necessary imports. You have to solve the prob……

思考题 for China Birthday! Military parade It's going to be the 70th birthday of China! Orange Boy is looking forward to it and to celebrate this, he became Red Boy! So he proposes the following problem for you: On Oct.1st. There is a military para……

思考题 in ancient Chinese Orange Boy Can You Solve It Out? / 神犇，解乎？ 令和元年九月二十一日，余与神犇同饮，乐也。见月色空明，开而无雨，犇曰「如此宴酣之乐，何不以卵玩之以陶冶情操？」，杂然相许。 但见数卵，神犇摆之成堆。共N堆，i堆A_i卵耳。犇问之「……

搬运NFLS训练 NFLS Programming Training 2019-9-19 For international readers, please scroll down. A - 求和(sum.cpp) Statement 求 f(n)=a^{n+k} 的第q项到p项的和。 Input n k q p Output 一个整数，取模10^9+7 Example In: 2 0 2 3 Out: 12 Constriants For 100……

思考题 in poems Uncomment In a, programmers' day, Comment, all the lines I may. N lines, there should be. Commented A_i as I've been. Select a region, Toggle its comment. Cost of all, is (R-L+1)*A+B for all. Or add a comment, just in one line. Move……

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……