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You are given a data structure of employee information, which includes the employee’s unique id, his importance value and his direct subordinates’ id.For example, employee 1 is the leader of employe...

Reverse a singly linked list.Example:Input: 1->2->3->4->5->NULLOutput: 5->4->3->2->1->NULLFollow up:A linked list can be reversed either iteratively or recursively....

A matrix is Toeplitz if every diagonal from top-left to bottom-right has the same element.Now given an M x N matrix, return True if and only if the matrix is Toeplitz.Example 1:Input:matrix = [...

We are given two sentences A and B. (A sentence is a string of space separated words. Each word consists only of lowercase letters.)A word is uncommon if it appears exactly once in one of the sent...

1154. Day of the YearGiven a string date representing a Gregorian calendar date formatted as YYYY-MM-DD, return the day number of the year.Example 1:Input: date = “2019-01-09”Output: 9Explanat...