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Prefix and brush question summary of leetcode 2 1 - region and retrieval - array immutable Title Link: Title Link stamp here!!! Idea: simple prefix sum. During initialization, use the sum array to store the prefix sum of the num array, and then calculate the interval sum from left to right in the num array, which can be obtained directly from ...

Title Description Given two arrays of length m and N, the elements are composed of 0-9, representing the numbers on each bit of two natural numbers. Now select k (k < = m + n) numbers from the two arrays and splice them into a new number. The numbers taken from the same array are required to maintain their relative order in the origina ...

Hello, everyone. I'm handsome. Today, let's judge whether the brackets are valid. I don't know what to say. Let's start the whole thing. LeetCode 20: valid parentheses meaning of the title Given a string s that only includes' (',') ',' {','} ',' [','] ', judge whether the string is valid. Examples Input: s = "() [] {}" Outpu ...

A center The center of   heap is dynamic extremum, which is indispensable. 1046. Weight of the last stone There is a pile of stones, and the weight of each stone is a positive integer. Each round, choose the two heaviest stones and crush them together. Suppose the weight of the stone is x and Y respectively, and x < = y. Then ...

Tip: This article has 6000 words, rough reading takes about 5 minutes and intensive reading takes about 30 minutes viewpoint This year's provincial tournament is a little different from the past. It pays more attention to mathematics, algorithms and ideas, and is a little closer to ACM. I believe this is a trend, and the future Blue Bri ...

subject Give two positively ordered (from small to large) arrays nums1 and nums2 of sizes m and n, respectively. Please find and return the median of these two positive arrays. The time complexity of the algorithm should be O(log (m+n)). Tips:      ~~~~      num ...

Catalogue of series articles I Array type problem solving method 1: dichotomy II Array type problem solving method 2: Double finger needle method III Array type problem solving method 3: sliding window IV Array type problem solving method 4: simulation V The basic operation and classic topics of the linked list Vi Classic title of hash tab ...

LeetCode problem solution - dynamic programming - subsequence problem Reference: labuladong WeChat official account, hand handle brush, dynamic programming series, official account, excellent public address, recommended to everyone. In this paper, we will pick up the routine of sub sequence problem. In fact, there are two kinds of templ ...

array Arrays is a tool class that operates on arrays. Common member methods public static String toString(int[] a) //Convert array to string public static void sort(int[] a) //Sort the array public static int binarySearch(int[] a,int key) //Binary search The toString() source code is as follows: public static String toString(int[] a) { ...

Title quoted from https://leetcode-cn.com/ Graphic data structure and algorithm Daily learning Day02 learning notes 20 numeric values represent strings Title Description: Please implement a function to judge whether the string represents a numeric value (including integer and decimal). The values (in order) can be divided into th ...