1193 - Dice (II) PDF (English) Statistics Forum Time Limit: 3 second(s) Memory Limit: 32 MB You have N dices; each of them has K faces numbered from 1 to K. Now you can arrange the N dices in a line. If the summation of the top faces of the dices…
Time Limit: 1sec Memory Limit:32MB Description John is moving to the penthouse of a tall sky-scraper. He packed all his stuff in boxes and drove them to the entrance of the building on the ground floor. Unfortunately the elevator is out of order,…
题目大意:给出一棵有根树(根为 \(0\) ),点有点权.可以删除点(非根),并将其子树接到其父亲上.我们称一个树为树堆当前仅当树上每个点都满足其权值大于等于其子树中所有点的点权.现在对于每个点要求其子树删去一点后形成的树堆的最大大小,其中这个点在其自身的子问题内是不可删除的. 题解 这个每个点的子树都求一遍一眼就可以看出是 线段树合并 或者 dsu on tree ,然后略加思索发现这个维护的过程类似 DP ,可以发现不太适合 dsu on tree ,因此选择 线段树合并 .现在考虑怎么维护…
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…
[it-ebooks]电子书列表 [2014]: Learning Objective-C by Developing iPhone Games || Leverage Xcode and Objective-C to develop iPhone games http://it-ebooks.info/book/3544/Learning Web App Development || Build Quickly with Proven JavaScript Techniques http:…