构造 因为题目只要求两位相同,所以可以暴力枚举这两位所有的可能性,方案数为\(O(n^2)\). 但是,这么做是显然不优的,因为完全没有用到第三位. 观察题目条件:n为偶数. 就想一想能不能奇数偶数分开来做呢? 注意到一共有三位,总共放到奇偶两个抽屉中,必有一个抽屉有两个位,即存在两位同奇偶. 我们就想办法枚举到这两位同奇偶的数对. 一个有序三元组\((a,b,c)\)可以覆盖三个有序的二元组\((a,b,?),(?,b,c),(a,?,c)\) 这样的有序二元组取值为\([1,n]\)时共有\…

Series的简单运算 import numpy as np import pandas as pd s1=pd.Series([1,2,3],index=['A','B','C']) print(s1) 结果: A 1 B 2 C 3 dtype: int64 s2=pd.Series([4,5,6,7],index=['B','C','D','E']) print(s2) 结果: B 4 C 5 D 6 E 7 dtype: int64 print(s1+s2)#对应的index相加,NaN…

原地址http://www.starlino.com/dcm_tutorial.html Introduction This article is a continuation of my IMU Guide, covering additional orientation kinematics topics. I will go through some theory first and then I will present a practical example with code bui…

First off, we can use our Line-Point Distance code to test for the "BOUNDARY" case. If the distance from any segment to the test point is 0, then return "BOUNDARY". If you didn't have that code pre-written, however, it would probably b…

TangoAreaDescriptionMetaData com.google.atap.tangoservice Class TangoAreaDescriptionMetaData java.lang.Object com.google.atap.tangoservice.TangoAreaDescriptionMetaData   public class TangoAreaDescriptionMetaData extends java.lang.Object Metadata for…

题目链接: POJ:http://poj.org/problem? id=3488 HDU:pid=1915">http://acm.hdu.edu.cn/showproblem.php?pid=1915 Description Following the account of Jules Verne, a scrambled message written by the middle age alchemist Arne Saknussemm, and deciphered by pro…

http://vjudge.net/problem/viewProblem.action?id=37480 East Central Regional Contest Problem C: Hexagon Perplexagon A well known puzzle consists of hexagonal pieces, each with the numbers through printed on the sides. Each piece has a different arrang…

博客搬至blog.csgrandeur.com,cnblogs不再更新. 新的题解会更新在新博客:http://blog.csgrandeur.com/2014/01/15/LeetCode-OJ-Solution/ ———————————————————————————————————————— ———————————————————————————————————————— LeetCode OJ 题解 LeetCode OJ is a platform for preparing tech…

D. Data Center Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/560/problem/B Description The startup "Booble" has shown explosive growth and now it needs a new data center with the capacity of m petabytes. Booble can b…

转载请注明出处: http://www.cnblogs.com/fraud/          ——by fraud 下午在HDU上打了一下今年北京区域赛的重现,过了5题,看来单挑只能拿拿铜牌,呜呜. 先将这五题的题解放上来,剩余题目等搞出来再补上 A题 A Curious Matt Time Limit: 2000/2000 MS (Java/Others)    Memory Limit: 512000/512000 K (Java/Others) Problem Description T…