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RSS订阅原创 Codeforces Round #639 (div2)
A. Puzzle Pieces 求能否将拼图拼成nm,可推出只有当nm <= n+m才能满足条件 #include <algorithm> #include <cstdio> #include <cstring> #include <iostream> #include <map> #include <vector> using namespace std; typedef long long ll; const int
2020-05-11 23:32:10
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原创 Knights in Chessboard （找规律）
Knights in Chessboard （找规律） LightOJ-1010 解题思路： 如果只有一行、一列， 放满； 如果只有两行，每隔一个田字格可以放一个田字格； 其他情况可全放白格子或全放黑格子； #include <algorithm> #include <cmath> #include <cstdio> #include <cstring&...
2020-02-20 13:54:31
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原创 Leading and Trailing（快速幂+思维）
Leading and Trailing LightOJ - 1282 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 starts with an in...
2020-01-10 22:02:48
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原创 Goldbach`s Conjecture（线性筛法）
Goldbach`s Conjecture LightOJ - 1259 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 2, can be expr...
2020-01-10 21:35:05
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原创 Harmonic Number (II) （规律题）
Harmonic Number (II) LightOJ - 1245 I was trying to solve problem ‘1234 - Harmonic Number’, I wrote the following code long long H( int n ) { long long res = 0; for( int i = 1; i <= n; i++ ...
2020-01-10 21:04:43
273
原创 Sigma Function（唯一分解定理）
Sigma Function LightOJ - 1336 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 divisors of a numbe...
2020-01-09 18:15:58
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原创 Aladdin and the Flying Carpet （唯一分解定理）
Aladdin and the Flying Carpet LightOJ - 1341 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 first m...
2020-01-08 17:58:07
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原创 Bi-shoe and Phi-shoe（欧拉函数）
Bi-shoe and Phi-shoe LightOJ - 1370 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 students, so ...
2020-01-08 16:43:58
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