꿈꾸는공학도

https://leetcode.com/problems/count-complete-tree-nodes/description/Given the root of a complete binary tree, return the number of the nodes in the tree.According to Wikipedia, every level, except possibly the last, is completely filled in a complete binary tree, and all nodes in the last level are as far left as possible. It can have between 1 and 2h nodes inclusive at the last level h.Design a..

https://leetcode.com/problems/my-calendar-i/description/?envType=daily-question&envId=2024-09-26You are implementing a program to use as your calendar. We can add a new event if adding the event will not cause a double booking.A double booking happens when two events have some non-empty intersection (i.e., some moment is common to both events.).The event can be represented as a pair of integers ..

https://leetcode.com/problems/sum-of-prefix-scores-of-strings/description/?envType=daily-question&envId=2024-09-25You are given an array words of size n consisting of non-empty strings.We define the score of a string word as the number of strings words[i] such that word is a prefix of words[i].For example, if words = ["a", "ab", "abc", "cab"], then the score of "ab" is 2, since "ab" is a prefix ..

https://leetcode.com/problems/find-the-length-of-the-longest-common-prefix/description/?envType=daily-question&envId=2024-09-24You are given two arrays with positive integers arr1 and arr2.A prefix of a positive integer is an integer formed by one or more of its digits, starting from its leftmost digit. For example, 123 is a prefix of the integer 12345, while 234 is not.A common prefix of two in..

https://leetcode.com/problems/palindrome-linked-list/description/Given the head of a singly linked list, return true if it is a palindrome or false otherwise. Example 1:Input: head = [1,2,2,1]Output: trueExample 2:Input: head = [1,2]Output: false Constraints:The number of nodes in the list is in the range [1, 105].0  Follow up: Could you do it in O(n) time and O(1) space? 해당 문제를 Recursion / Data..

https://leetcode.com/problems/extra-characters-in-a-string/description/?envType=daily-question&envId=2024-09-23You are given a 0-indexed string s and a dictionary of words dictionary. You have to break s into one or more non-overlapping substrings such that each substring is present in dictionary. There may be some extra characters in s which are not present in any of the substrings.Return the m..

https://leetcode.com/problems/remove-duplicates-from-sorted-list-ii/description/Given the head of a sorted linked list, delete all nodes that have duplicate numbers, leaving only distinct numbers from the original list. Return the linked list sorted as well. Example 1:Input: head = [1,2,3,3,4,4,5]Output: [1,2,5]Example 2:Input: head = [1,1,1,2,3]Output: [2,3] Constraints:The number of nodes in t..

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..