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CF431C k-Tree dp
Quite recently a creative student Lesha had a lecture on trees. After the lecture Lesha was inspired and came up with the tree of his own which he cal ...
分类:其他好文   时间:2018-12-01 20:05:22    阅读次数:229
Tree总结
树结构问题因为容易写出解法,因此经常出现在面试题中 1. 树的种类 1) Tree 2) Binary Trees 3) Binary Search Trees(BST) : used to sorted or ordered data. //解决方案:recursion 查找操作(fast and ...
分类:其他好文   时间:2018-12-01 18:40:43    阅读次数:191
UVA-122(Trees on the level)
Trees on the level 题目链接: https://vjudge.net/problem/UVA-122 题目意思: 给你一些(,)让你建立一棵树,直到输入()结束建树,然后判断树是否完整,如果没有结点未赋值或者被赋值两次,就按层次遍历输出树,否则输出not complete 代码: ...
分类:其他好文   时间:2018-11-26 00:08:26    阅读次数:226
[LeetCode&Python] Problem 427. Construct Quad Tree
We want to use quad trees to store an N x N boolean grid. Each cell in the grid can only be true or false. The root node represents the whole grid. Fo ...
分类:编程语言   时间:2018-11-21 16:07:23    阅读次数:172
894. All Possible Full Binary Trees
一、题目描述 A full binary tree is a binary tree where each node has exactly 0 or 2 children. Return a list of all possible full binary trees with N nodes. ...
分类:其他好文   时间:2018-11-19 21:37:58    阅读次数:192
872. Leaf-Similar Trees
1. Quesiton: 872. Leaf-Similar Trees url: https://leetcode.com/problems/leaf-similar-trees/description/ Consider all the leaves of a binary tree. From ...
分类:其他好文   时间:2018-11-17 23:20:29    阅读次数:198
617. Merge Two Binary Trees
1. Quetions: 617. Merge Two Binary Trees url: https://leetcode.com/problems/merge-two-binary-trees/description/ Given two binary trees and imagine tha ...
分类:其他好文   时间:2018-11-17 19:12:08    阅读次数:107
POJ-1655 Balancing Act(树的重心)
Consider a tree T with N (1 <= N <= 20,000) nodes numbered 1...N. Deleting any node from the tree yields a forest: a collection of one or more trees. ...
分类:其他好文   时间:2018-11-14 21:03:04    阅读次数:156
xgboost 特征重要性计算
在XGBoost中提供了三种特征重要性的计算方法: ‘weight’ - the number of times a feature is used to split the data across all trees. ‘gain’ - the average gain of the featur ...
分类:其他好文   时间:2018-11-13 12:18:22    阅读次数:411
python取aws s3文件
importboto3importioimportpandasaspd#Setbelowparametersbucket=‘<bucketname>‘key=‘data/training/iris.csv‘endpointName=‘decision-trees‘#PullourdatafromS3s3=boto3.client(‘s3‘)f=s3.get_object(Bucket=
分类:编程语言   时间:2018-11-12 19:58:51    阅读次数:1112
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