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No link is provided for this question Title Description Given a tree. We think one x → y x\rightarrow y Simple path of x → y( x ≠ ...

01 - sum of two numbers - js describe Given an integer array numbers and a target value target, please find two subscripts in the array that add up to the target value, and the returned subscripts are arranged in ascending order. Example 1 Input:[3,2,4],6 Return value:[2,3] Note: because 2+4=6 ，And the subscript of 2 is 2, and the subscrip ...

preface Tree chain subdivision divides the edges of the tree into many chains, so as to reduce the complexity of modifying queries on the tree. This is an introduction to light and heavy chain segmentation. Concept: Heavy son: the son with the most nodes in the subtree. If the subtrees of two sons are the same, then any one of them. Light son: ...

prefaceAfter a year of self-study, JAVA ABA finally made an appointment for an interview. However, the interviewer asked her to talk about her understanding of sorting algorithm.Interviewer: do you know anything about algorithms? Sort this one, okay?ABBA ABBA: understand that the sorting algorithm mainly includes bubble sort, insert sort, Hill ...

Title Description   Roman numerals contain the following seven characters: I, V, X, L, C, D and M. Character           numerical value I             1 V             5 X             10 L             50 C             100 D             500 M             1000 For example, the Roman numeral 2 is written as II, which ...

Luogu topic: P1093 [NOIP2007 popularization group] scholarship Title Description A primary school has recently received a sponsorship and plans to give part of it to the top five students with excellent academic achievements. At the end of the term, each student has three grades: Chinese, mathematics and English. First, sort according to the ...

You are participating in a variant of Zuma game. In this Zuma game variant, there is a row of colored balls on the desktop. The color of each ball may be red 'R', yellow 'Y', blue 'B', green 'G' or white 'W'. You also have some colored balls in your hand. Your goal is to empty all the balls on the table. Each round: Choose any one of the col ...

1, Hierarchical traversal of binary tree It is unrealistic to traverse directly, because there are more nodes in the future, and not all nodes in each layer are 2k-1. If you traverse a node, save the child of the node and get it from the structure next time. Here, the child is saved in a queue (the node first placed in the space is ...

Determine whether an integer is palindrome Title Description: Source: LeetCode 09 palindromes Give you an integer x, if x is a palindrome integer, return true; Otherwise, return false. Palindrome numbers refer to integers whose positive order (left-to-right) and reverse order (right-to-left) are read the same. For example, 121 is palindrome a ...

Decision tree is a basic classification and regression method. This chapter mainly discusses the decision tree for classification. The decision tree model has a tree structure. In the classification problem, it represents the process of classifying instances based on features. It can be considered as a set of if then rules, or as a conditional ...