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全部文章（共388篇）

Codeforces1009D——Relatively Prime Graph

Let’s call an undirected graph G=(V,E) relatively prime if and only if for each edge (v,u)∈E GCD(v,u)=1 (the greatest common divisor of v and u is 1)....

2021-04-05

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Codeforces1009E——Intercity Travelling

Leha is planning his journey from Moscow to Saratov. He hates trains, so he has decided to get from one city to another by car. The path from Moscow ...

2021-04-05

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poj3660——Cow Contest

N (1 ≤ N ≤ 100) cows, conveniently numbered 1..N, are participating in a programming contest. As we all know, some cows code better than others. Each ...

2021-04-05

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poj3169——Layout

Like everyone else, cows like to stand close to their friends when queuing for feed. FJ has N (2 <= N <= 1,000) cows numbered 1..N standing alon...

2021-04-05

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hdu2157——How many ways??

春天到了, HDU校园里开满了花, 姹紫嫣红, 非常美丽. 葱头是个爱花的人, 看着校花校草竞相开放, 漫步校园, 心情也变得舒畅. 为了多看看这迷人的校园, 葱头决定, 每次上课都走不同的路线去教室, 但是由于时间问题, 每次只能经过k个地方, 比方说, 这次葱头决定经过2个地方, 那他可以先去问...

2021-04-05

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LightOJ1336——Sigma Function

Sigma function is an interesting function in Number Theory. It is denoted by the Greek letter Sigma (σ). This function actually denotes the sum of all...

2021-04-05

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LightOJ1341——Aladdin and the Flying Carpet

It’s said that Aladdin had to solve seven mysteries before getting the Magical Lamp which summons a powerful Genie. Here we are concerned about the fi...

2021-04-05

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LightOJ1370——Bi-shoe and Phi-shoe

Bamboo Pole-vault is a massively popular sport in Xzhiland. And Master Phi-shoe is a very popular coach for his success. He needs some bamboos for his...

2021-04-05

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LightOJ1282——Leading and Trailing

You are given two integers: n and k, your task is to find the most significant three digits, and least significant three digits of nk. Input Input s...

2021-04-05

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LightOJ1259——Goldbach`s Conjecture

Goldbach’s conjecture is one of the oldest unsolved problems in number theory and in all of mathematics. It states: Every even integer, greater than ...

2021-04-05

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