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🔥 subject Enter the integer array arr to find the minimum number of k.   ☘️ analysis Solution 1 - simple sorting First of all, you can think of a very simple idea: sort the data from small to large, and take the first k numbers. Analysis: time complexity O(nlogn), that is, sorting overhead. It's not hard to think of a problem. We only ...

LeetCode notes: Biweekly Contest 68 1. Topic 1 1. Problem solving ideas2. Code implementation 2. Topic 2 1. Problem solving ideas2. Code implementation 3. Topic 3 1. Problem solving ideas2. Code implementation 4. Topic 4 1. Problem solving ideas2. Code implementation 1. Topic 1 The test question link given in questi ...

The original intention of writing this article is to sort out and review the questions you have brushed 1. Sum of two numbers 1. Sum of two numbers Given an integer array nums and an integer target value target, please find the two integers with and as the target value target in the array and return their array subscripts. You can assume ...

Original address: http://www.usaco.org/index.php?page=viewproblem2&cpid=87 Title Description Hearing that the latest fashion trend was cows with two spots on their hides, Farmer John has purchased an entire herd of two-spot cows. Unfortunately, fashion trends tend to change quickly, and the most popular current fashion is cows with only on ...

subject Give you a class: class FooBar { public void foo() { for (int i = 0; i < n; i++) { print("foo"); } } public void bar() { for (int i = 0; i < n; i++) { print("bar"); } } } Two different threads will share a FooBar instance: Thread A will call the foo() method, and Thread B will call the bar ...

In order from simple to difficult, break through the hurdles in turn (the title number is the serial number of leetcode) Main JAVA Source: https://leetcode-cn.com/ catalogue 1. Sum of two numbers (1) - hash table lookup 2. Delete duplicates in the ordered array (26) -- double pointers 3. Remove element (27) - Optimization of double pointe ...

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Design hash set of leetcode daily question Title Link: https://leetcode-cn.com/problems/design-hashset/ Topic Description: design a hash set without using any built-in hash table library. Implement the MyHashSet class: void add(key) inserts the value key into the hash set. bool contains(key) Returns whether the value key exists in the hash ...

⭐ Introduction ⭐ ️ Hello, I'm Zhijie. I believe you all know the importance of data structure and algorithm. Among them, the linked list is the top priority. Many brothers feel that it is nothing more than a single linked list and a double linked list. It is very simple to add, delete, change and query. Indeed, although the linked list is sim ...

This week's competition is relatively simple. I wrote three questions in an hour. The last question, I forgot how to write the longest common subsequence of greedy plus two points. dp's card is lost, and I supplemented it after it. 5838. Check whether the string is an array prefix class Solution { public boolean isPrefixString(S ...