꿈꾸는공학도

https://leetcode.com/problems/count-the-number-of-consistent-strings/description/?envType=daily-question&envId=2024-09-12You are given a string allowed consisting of distinct characters and an array of strings words. A string is consistent if all characters in the string appear in the string allowed.Return the number of consistent strings in the array words. Example 1:Input: allowed = "ab", word..

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/delete-nodes-from-linked-list-present-in-array/description/You are given an array of integers nums and the head of a linked list. Return the head of the modified linked list after removing all nodes from the linked list that have a value that exists in nums. Example 1:Input: nums = [1,2,3], head = [1,2,3,4,5]Output: [4,5]Explanation:Remove the nodes with values 1, 2..

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/binary-tree-postorder-traversal/?envType=daily-question&envId=2024-09-04Given the root of a binary tree, return the postorder traversal of its nodes' values. Example 1:Input: root = [1,null,2,3]Output: [3,2,1]Explanation:Example 2:Input: root = [1,2,3,4,5,null,8,null,null,6,7,9]Output: [4,6,7,5,2,9,8,3,1]Explanation:Example 3:Input: root = []Output: []Example 4:Inpu..

Given an array of integers nums, sort the array in increasing order based on the frequency of the values. If multiple values have the same frequency, sort them in decreasing order.Return the sorted array. Example 1:Input: nums = [1,1,2,2,2,3]Output: [3,1,1,2,2,2]Explanation: '3' has a frequency of 1, '1' has a frequency of 2, and '2' has a frequency of 3.Example 2:Input: nums = [2,3,1,3,2]Output..

https://leetcode.com/problems/sum-of-digits-of-string-after-convert/description/?envType=daily-question&envId=2024-09-03You are given a string s consisting of lowercase English letters, and an integer k.First, convert s into an integer by replacing each letter with its position in the alphabet (i.e., replace 'a' with 1, 'b' with 2, ..., 'z' with 26). Then, transform the integer by replacing it w..