Be a Good Techer and Tech for Good. www.goodtecher.com
Description https://leetcode.com/problems/count-substrings-with-only-one-distinct-letter/ Given a string s, return the number of substrings that have only one distinct letter. Example 1: Input: s = “aaaba” Output:…
Description https://leetcode.com/problems/reverse-linked-list-ii/ Given the head of a singly linked list and two integers left and right where left <= right, reverse the nodes of the list from…
Description https://leetcode.com/problems/remove-duplicates-from-sorted-list-ii/ Given the head of a sorted linked list, delete all nodes that have duplicate numbers, leaving only distinct numbers from the…
Description https://leetcode.com/problems/combinations/ Given two integers n and k, return all possible combinations of k numbers out of the range [1, n]. You may return the answer in any…
Description https://leetcode.com/problems/number-of-provinces/ There are n cities. Some of them are connected, while some are not. If city a is connected directly with city b, and…
Description https://leetcode.com/problems/employee-importance/ You have a data structure of employee information, which includes the employee’s unique id, their importance value, and…
Description https://leetcode.com/problems/make-two-arrays-equal-by-reversing-sub-arrays/ Given two integer arrays of equal length target and arr. In one step, you can select any non-empty sub-array of arr and reverse it. You…
Description https://leetcode.com/problems/game-play-analysis-i/ SQL Schema Table: Activity +————–+———+ | Column Name | Type | +————–+———+ | player_id | int | | device_id…
Description https://leetcode.com/problems/sellers-with-no-sales/ SQL Schema Table: Customer +—————+———+ | Column Name | Type | +—————+———+ | customer_id | int | | customer_name…
Description https://leetcode.com/problems/largest-odd-number-in-string/ You are given a string num, representing a large integer. Return the largest-valued odd integer (as a string) that is a non-empty substring of num,…