17 tài liệu đã gắn thẻ với "leetcode"

Given a non-empty array of integers `nums`, every element appears twice except for one. Find that single one.

Given `head`, the head of a linked list, determine if the linked list has a cycle in it.

Write a solution to report the first name, last name, city, and state of each person in the `Person` table. If the address of a `personId` is not present in the `Address` table, report null instead.

Write a solution to find the second highest salary from the `Employee` table. If there is no second highest salary, return `null` (return `None` in Pandas).

Write a solution to find the nth highest salary from the `Employee` table. If there is no nth highest salary, return `null`.

Write a solution to find the rank of the scores.

Write a solution to find the employees who earn more than their managers.

Write a solution to report all the duplicate emails. Note that it's guaranteed that the email field is not `NULL`.

Write a solution to find all customers who never order anything.

Write a function that takes the binary representation of an unsigned integer and returns the number of `1` bits it has (also known as the Hamming weight).

Write a solution to delete all duplicate emails, keeping only one unique email with the smallest id. After running your script, the answer shown is the `Person` table. The driver will first compile and run your piece of code and then show the `Person` table. The final order of the `Person` table does not matter.

Find all dates' `Id` with higher temperatures compared to its previous dates (yesterday).

Given an integer `n`, return an array `ans` of length `n + 1` such that for each `i` (0 <= i <= n), `ans[i]` is the number of 1's in the binary representation of `i`.

Write a solution to find the first login date for each player.

Write a solution to find the names of all the salespersons who did not have any orders related to the company with the name `RED`.

Find the number of possible unique paths that the robot can take to reach the bottom-right corner.

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