【Leetcode_easy】872. Leaf-Similar Trees

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【Leetcode_easy】872. Leaf-Similar Trees

problem 872. Leaf-Similar Trees 参考 1. Leetcode_easy_872. Leaf-Similar Trees; 完…

【线性代数】6-6:相似矩阵(Similar Matrices)

title: [线性代数]6-6:相似矩阵(Similar Matrices) categories: Mathematic Linear Algebra keywords: Similar Matrices Jordan Form Eigenvalues Eigenvectors toc: true date: 2017-11-29 09:08:12 Abstract: 本文主要介绍根据矩阵对角化以及特征值引出的相似矩阵的性质和特点 Keywords: Similar Matrices,Jor…

【HDU4010】【LCT】Query on The Trees

Problem Description We have met so many problems on the tree, so today we will have a query problem on a set of trees. There are N nodes, each node will have a unique weight Wi. We will have four kinds of operations on it and you should solve them ef…

【leetcode】 Unique Binary Search Trees (middle)☆

Find the contiguous subarray within an array (containing at least one number) which has the largest product. For example, given the array [2,3,-2,4],the contiguous subarray [2,3] has the largest product = 6. 找数字连续最大乘积子序列. 思路:这个麻烦在有负数和0,我的方法,如果有0,一切都设…

【动态规划】Codeforces 711C Coloring Trees

题目链接: http://codeforces.com/problemset/problem/711/C 题目大意: 给N棵树,M种颜色,已经有颜色的不能涂色,没颜色为0,可以涂色,每棵树I涂成颜色J花费PIJ.求分成K个颜色段(1112221为3个颜色段)的最小花费.无解输出-1. 题目思路: [动态规划] f[i][j][k]表示前i个树分成j段,最后一个颜色是k的花费. 根据当前这棵树是否可以涂色,上一棵树是否可以涂色转移. 直接枚举这个树和上棵树的颜色,N4居然没T. // //by c…