꿈꾸는공학도

https://leetcode.com/problems/count-the-number-of-good-subarrays/description/Given an integer array nums and an integer k, return the number of good subarrays of nums.A subarray arr is good if it there are at least k pairs of indices (i, j) such that i  and arr[i] == arr[j].A subarray is a contiguous non-empty sequence of elements within an array. Example 1:Input: nums = [1,1,1,1,1], k = 10Outpu..

https://leetcode.com/problems/insert-greatest-common-divisors-in-linked-list/description/?envType=daily-question&envId=2024-09-10Given the head of a linked list head, in which each node contains an integer value.Between every pair of adjacent nodes, insert a new node with a value equal to the greatest common divisor of them.Return the linked list after insertion.The greatest common divisor of tw..

https://leetcode.com/problems/count-good-nodes-in-binary-tree/Given a binary tree root, a node X in the tree is named good if in the path from root to X there are no nodes with a value greater than X.Return the number of good nodes in the binary tree. Example 1:Input: root = [3,1,4,3,null,1,5]Output: 4Explanation: Nodes in blue are good.Root Node (3) is always a good node.Node 4 -> (3,4) is the ..

https://leetcode.com/problems/number-of-good-leaf-nodes-pairs/description/You are given the root of a binary tree and an integer distance. A pair of two different leaf nodes of a binary tree is said to be good if the length of the shortest path between them is less than or equal to distance.Return the number of good leaf node pairs in the tree. Example 1:Input: root = [1,2,3,null,4], distance = ..

https://leetcode.com/problems/find-missing-observations/description/?envType=daily-question&envId=2024-09-05You have observations of n + m 6-sided dice rolls with each face numbered from 1 to 6. n of the observations went missing, and you only have the observations of m rolls. Fortunately, you have also calculated the average value of the n + m rolls.You are given an integer array rolls of lengt..

https://leetcode.com/problems/number-complement/description/?envType=daily-question&envId=2024-08-22The complement of an integer is the integer you get when you flip all the 0's to 1's and all the 1's to 0's in its binary representation.For example, The integer 5 is "101" in binary and its complement is "010" which is the integer 2.Given an integer num, return its complement. Example 1:Input: nu..

https://leetcode.com/problems/partition-list/description/Given the head of a linked list and a value x, partition it such that all nodes less than x come before nodes greater than or equal to x.You should preserve the original relative order of the nodes in each of the two partitions. Example 1:Input: head = [1,4,3,2,5,2], x = 3Output: [1,2,2,4,3,5]Example 2:Input: head = [2,1], x = 2Output: [1,..

https://leetcode.com/problems/best-time-to-buy-and-sell-stock-ii/description/You are given an integer array prices where prices[i] is the price of a given stock on the ith day.On each day, you may decide to buy and/or sell the stock. You can only hold at most one share of the stock at any time. However, you can buy it then immediately sell it on the same day.Find and return the maximum profit yo..

https://leetcode.com/problems/remove-duplicates-from-sorted-list/description/Given the head of a sorted linked list, delete all duplicates such that each element appears only once. Return the linked list sorted as well. Example 1:Input: head = [1,1,2]Output: [1,2]Example 2:Input: head = [1,1,2,3,3]Output: [1,2,3] Constraints:The number of nodes in the list is in the range [0, 300].-100 The list ..

https://leetcode.com/problems/find-k-th-smallest-pair-distance/description/?envType=daily-question&envId=2024-08-14The distance of a pair of integers a and b is defined as the absolute difference between a and b.Given an integer array nums and an integer k, return the kth smallest distance among all the pairs nums[i] and nums[j] where 0  Example 1:Input: nums = [1,3,1], k = 1Output: 0Explanation..