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PAT甲级——A1138 Postorder Traversa【25】
Suppose that all the keys in a binary tree are distinct positive integers. Given the preorder and inorder traversal sequences, you are supposed to out ...
分类:其他好文   时间:2019-09-09 22:38:38    阅读次数:116
PAT 甲级 1049 Counting Ones (30 分)(找规律,较难,想到了一点但没有深入考虑嫌麻烦)***
1049 Counting Ones (30 分) 1049 Counting Ones (30 分) 1049 Counting Ones (30 分) The task is simple: given any positive integer N, you are supposed to co ...
分类:其他好文   时间:2019-09-07 22:40:16    阅读次数:91
PAT甲级——A1127 ZigZagging on a Tree【30】
Suppose that all the keys in a binary tree are distinct positive integers. A unique binary tree can be determined by a given pair of postorder and ino ...
分类:其他好文   时间:2019-09-06 22:39:34    阅读次数:112
如何理解正定矩阵和半正定矩阵
乍看正定和半正定会被吓得虎躯一震,因为名字取得不知所以,所以老是很排斥去理解这个东西是干嘛用的,下面根据自己和结合别人的观点解释一下什么是 正定矩阵(positive definite, PD) 和 半正定矩阵(positive semi definite, PSD) 。 定义 首先从定义开始对PD ...
分类:其他好文   时间:2019-09-04 21:05:36    阅读次数:2041
LightOJ-1038-Race to 1 Again(概率DP)
链接: https://vjudge.net/problem/LightOJ 1038 题意: Rimi learned a new thing about integers, which is any positive integer greater than 1 can be divided b ...
分类:其他好文   时间:2019-09-02 23:30:55    阅读次数:103
【满k叉树】Perfect Tree
题目描述 Given a positive integer k, we define a rooted tree to be k-perfect, if and only if it meets both conditions below:?Each node is either a leaf no ...
分类:其他好文   时间:2019-09-01 10:44:51    阅读次数:113
PAT甲级——A1104 Sum of Number Segments
Given a sequence of positive numbers, a segment is defined to be a consecutive subsequence. For example, given the sequence { 0.1, 0.2, 0.3, 0.4 }, we ...
分类:其他好文   时间:2019-09-01 10:42:46    阅读次数:77
Rolling The Polygon (2018-2019 ACM-ICPC, China Multi-Provincial Collegiate Programming Contest)(The 2019 Asia Yinchuan First Round Online Programming)
Bahiyyah has a convex polygon with nn vertices P0,P1,?,Pn?1P0,P1,?,Pn?1 in the counterclockwise order. Two vertices with consecutive indexes are adjac ...
分类:其他好文   时间:2019-09-01 10:37:36    阅读次数:80
Find The Multiple
https://vjudge.net/problem/POJ-1426 Given a positive integer n, write a program to find out a nonzero multiple m of n whose decimal representation con ...
分类:其他好文   时间:2019-09-01 01:37:18    阅读次数:91
2018 ACM-ICPC 宁夏 H.Fight Against Monsters(贪心)
It is my great honour to introduce myself to you here. My name is Aloysius Benjy Cobweb Dartagnan Egbert Felix Gaspar Humbert Ignatius Jayden Kasper L ...
分类:其他好文   时间:2019-08-31 14:58:40    阅读次数:87
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