Medium #30 Substring with Concatenation of All Words. Example 1: The word count of a sender is the total number of words sent by the sender. #14 Longest Common Prefix. Example 1: ; Each vowel 'o' may only be followed by an 'i' or a 'u'. Count Number of Teams. The pair (0, 2) is a bad pair since 2 - 0 != 3 - 4, 2 != -1. 65.3%: Easy: Example 1: You are given a string s.. A split is called good if you can split s into two non-empty strings s left and s right where their concatenation is equal to s (i.e., s left + s right = s) and the number of distinct letters in s left and s right is the same.. Return the number of good splits you can make in s.. You are given a string s.. A split is called good if you can split s into two non-empty strings s left and s right where their concatenation is equal to s (i.e., s left + s right = s) and the number of distinct letters in s left and s right is the same.. Return the number of good splits you can make in s.. Given a sorted array of distinct integers and a target value, return the index if the target is found. Example 1: Input: nums = [4,1,3,3] Output: 5 Explanation: The pair (0, 1) is a bad pair since 1 - 0 != 1 - 4. (soldiers can be part of multiple teams). Example 1: #28 Find the Index of the First Occurrence in a String. The appeal of a string is the number of distinct characters found in the string. ; Each vowel 'i' may not be followed by another 'i'. 65.3%: Easy: If the current number of teams is even, each team gets paired with another team.A total of n / 2 matches are played, and n / 2 teams advance to the next round. Given an integer n, your task is to count how many strings of length n can be formed under the following rules:. Given an array of string words. Example 1: Input: s = "leetcode" Output: 0 Example 2: Input: s = "loveleetcode" Output: 2 Example 3: Input: s = "aabb" Output:-1 Constraints: 1 <= s.length <= 10 5; s consists of only lowercase English letters. 77.1%: Easy: 2186: Minimum Number of Steps to Make Two Strings Anagram II. You are given an integer array coins representing coins of different denominations and an integer amount representing a total amount of money.. Return the fewest number of coins that you need to make up that amount.If that amount of money cannot be made up by any combination of the coins, return -1.. You may assume that you have an infinite number of each kind of coin. Medium. Return the number of teams you can form given the conditions. Since free questions may be even mistakenly taken down by some companies, only solutions will be post on now. Given two strings s1 and s2, return true if s2 contains a permutation of s1, or false otherwise. 73.3%: Easy: 2224: Minimum Number of Operations to Convert Time. ; If the current number of teams is odd, one team randomly advances in the tournament, and the rest gets paired. You need to find the number of good triplets. You are also given a 2D integer array points where points[j] = [x j, y j] is a point with coordinates (x j, y j). (soldiers can be part of multiple teams). Return all strings in words which is substring of another word in any order. Given an array of integers nums and an integer k. A continuous subarray is called nice if there are k odd numbers on it. Omit all the empty parenthesis pairs that do not affect the one-to-one mapping relationship Return the minimum number of steps to make s palindrome.. A Palindrome String is one that reads the same backward as well as forward.. 65.3%: Easy: String words[i] is substring of words[j], if can be obtained removing some characters to left and/or right side of words[j]. Return the number of nice sub-arrays. 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 2 h nodes inclusive at the last level h.. Design an algorithm that runs in less than O(n) time complexity. 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: Medium. You are given an integer n, the number of teams in a tournament that has strange rules:. You have a chat log of n messages. Node 4 -> (3,4) is the maximum value in the path starting from the 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 2 h nodes inclusive at the last level h.. Design an algorithm that runs in less than O(n) time complexity. Given an array of string words. A substring is a contiguous sequence of characters within a string. Given a string s and an array of strings words, determine whether s is a prefix string of words. Example 1: Input: nums = [1,1,1,2,2,3], k = 2 Output: [1,2] Example 2: Input: nums = [1], k = 1 Output: [1] Constraints: 1 <= nums.length <= 10 5-10 4 <= nums[i] <= 10 4; k is in the range [1, the number of unique elements in the array]. Any cells outside of the grid are considered water cells. You are given two m x n binary matrices grid1 and grid2 containing only 0's (representing water) and 1's (representing land).An island is a group of 1's connected 4-directionally (horizontal or vertical). 73.3%: Easy: 2224: Minimum Number of Operations to Convert Time. Medium #17 Letter Combinations of a Phone Number. A substring is a contiguous sequence of characters within a string. Given an array of string words. Medium #16 3Sum Closest. Given a sorted array of distinct integers and a target value, return the index if the target is found. Given a string s, return the sum of countUniqueChars(t) where t is a substring of s. The test cases are generated such that the answer fits in a 32-bit integer. Return the minimum number of steps to make s palindrome.. A Palindrome String is one that reads the same backward as well as forward.. ; Left parenthesis '(' must go before the corresponding right parenthesis ')'. You are also given a 2D integer array points where points[j] = [x j, y j] is a point with coordinates (x j, y j). 2231 169 Add to List Share. Medium #16 3Sum Closest. You are given two string arrays messages and senders where messages[i] is a message sent by senders[i].. A message is list of words that are separated by a single space with no leading or trailing spaces. Notice that some substrings can be repeated so in this case you have to count the repeated ones too. Example 1: Input: s1 = "ab", s2 = "eidbaooo" Output: true Explanation: s2 contains one permutation of s1 ("ba"). 2231 169 Add to List Share. Given an array of integers nums and an integer k. A continuous subarray is called nice if there are k odd numbers on it. to my old Leetcode repository, where there were 5.7k+ stars and 2.2k+ forks (ever the top 3 in the field). Note that a sender may send more than one message. 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 <= Node.val <= 100; The list is guaranteed to be sorted in ascending order. You are given two string arrays messages and senders where messages[i] is a message sent by senders[i].. A message is list of words that are separated by a single space with no leading or trailing spaces. The appeal of a string is the number of distinct characters found in the string. R.I.P. Given the head of a linked list, return the list after sorting it in ascending order.. To the right of 2 there is only 1 smaller element (1). Given the root of a binary tree, construct a string consisting of parenthesis and integers from a binary tree with the preorder traversal way, and return it. A string s is a prefix string of words if s can be made by concatenating the first k strings in words for some positive k no larger than words.length. Medium #29 Divide Two Integers. Return the number of teams you can form given the conditions. Given a 0-indexed string word and a character ch, reverse the segment of word that starts at index 0 and ends at the index of the first occurrence of ch (inclusive).If the character ch does not exist in word, do nothing.. For example, if word = "abcdefd" and ch = "d", then you should reverse the segment that starts at 0 and ends at 3 (inclusive).The resulting string will be "dcbaefd". Medium #17 Letter Combinations of a Phone Number. Example 1: Input: nums = [1,1,1,2,2,3], k = 2 Output: [1,2] Example 2: Input: nums = [1], k = 1 Output: [1] Constraints: 1 <= nums.length <= 10 5-10 4 <= nums[i] <= 10 4; k is in the range [1, the number of unique elements in the array]. You are given a string s.. A split is called good if you can split s into two non-empty strings s left and s right where their concatenation is equal to s (i.e., s left + s right = s) and the number of distinct letters in s left and s right is the same.. Return the number of good splits you can make in s.. You are given a 0-indexed string text and another 0-indexed string pattern of length 2, both of which consist of only lowercase English letters.. You can add either pattern[0] or pattern[1] anywhere in text exactly once.Note that the character can be added even at the beginning or at the end of text.. Return the maximum number of times pattern can occur as a subsequence of the Count Prefixes of a Given String. Given the root of a complete binary tree, return the number of the nodes in the tree.. Example 1: Given a string s and an array of strings words, determine whether s is a prefix string of words. R.I.P. You are given an integer array coins representing coins of different denominations and an integer amount representing a total amount of money.. Return the fewest number of coins that you need to make up that amount.If that amount of money cannot be made up by any combination of the coins, return -1.. You may assume that you have an infinite number of each kind of coin. Given an integer array nums and an integer k, return the k most frequent elements.You may return the answer in any order.. Example 1: #28 Find the Index of the First Occurrence in a String. Any left parenthesis '(' must have a corresponding right parenthesis ')'. 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 <= Node.val <= 100; The list is guaranteed to be sorted in ascending order. Given a string s.In one step you can insert any character at any index of the string. You are given a 0-indexed string text and another 0-indexed string pattern of length 2, both of which consist of only lowercase English letters.. You can add either pattern[0] or pattern[1] anywhere in text exactly once.Note that the character can be added even at the beginning or at the end of text.. Return the maximum number of times pattern can occur as a subsequence of the Example 1: To the right of 2 there is only 1 smaller element (1). Given the root of a complete binary tree, return the number of the nodes in the tree.. Example 1: Given an array of integers arr, and three integers a, b and c. You need to find the number of good triplets. 73.3%: Easy: 2224: Minimum Number of Operations to Convert Time. Counting Words With a Given Prefix. Node 4 -> (3,4) is the maximum value in the path starting from the String words[i] is substring of words[j], if can be obtained removing some characters to left and/or right side of words[j]. The i th rectangle has its bottom-left corner point at the coordinates (0, 0) and its top-right corner point at (l i, h i). Counting Words With a Given Prefix. ; Any right parenthesis ')' must have a corresponding left parenthesis '('. A triplet (arr[i], arr[j], arr[k]) is good if the following conditions are true: A triplet (arr[i], arr[j], arr[k]) is good if the following conditions are true: The count-and-say sequence is a sequence of digit strings defined by the recursive formula:. #28 Find the Index of the First Occurrence in a String. The pair (0, 2) is a bad pair since 2 - 0 != 3 - 4, 2 != -1. A substring is a contiguous sequence of characters within a string. Medium #16 3Sum Closest. Given an array of integers arr, and three integers a, b and c. You need to find the number of good triplets. Given a sorted array of distinct integers and a target value, return the index if the target is found. 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.. Note that a sender may send more than one message. A substring is a contiguous sequence of characters within a string. Given a string s.In one step you can insert any character at any index of the string. Given a 0-indexed string word and a character ch, reverse the segment of word that starts at index 0 and ends at the index of the first occurrence of ch (inclusive).If the character ch does not exist in word, do nothing.. For example, if word = "abcdefd" and ch = "d", then you should reverse the segment that starts at 0 and ends at 3 (inclusive).The resulting string will be "dcbaefd". ; Each vowel 'i' may not be followed by another 'i'. Example 1: Note that a sender may send more than one message. Count Prefixes of a Given String. String words[i] is substring of words[j], if can be obtained removing some characters to left and/or right side of words[j]. Given a string s, return the total appeal of all of its substrings. Return the minimum number of steps to make s palindrome.. A Palindrome String is one that reads the same backward as well as forward.. Given a string s, find the first non-repeating character in it and return its index.If it does not exist, return -1.. countAndSay(1) = "1" countAndSay(n) is the way you would "say" the digit string from countAndSay(n-1), which is then converted into a different digit string. 77.1%: Easy: 2186: Minimum Number of Steps to Make Two Strings Anagram II. You are given two m x n binary matrices grid1 and grid2 containing only 0's (representing water) and 1's (representing land).An island is a group of 1's connected 4-directionally (horizontal or vertical). The i th rectangle has its bottom-left corner point at the coordinates (0, 0) and its top-right corner point at (l i, h i). Return the number of nice sub-arrays. We can scramble a string s to get a string t using the following algorithm: If the length of the string is 1, stop. Any cells outside of the grid are considered water cells. Each character is a lower case vowel ('a', 'e', 'i', 'o', 'u')Each vowel 'a' may only be followed by an 'e'. to my old Leetcode repository, where there were 5.7k+ stars and 2.2k+ forks (ever the top 3 in the field). Hard #31 Next Permutation. Given an integer array nums and an integer k, return the k most frequent elements.You may return the answer in any order.. 2231 169 Add to List Share. Return the number of strings in words that are a prefix of s. A prefix of a string is a substring that occurs at the beginning of the string. Example 1: Input: nums = [1,1,1,2,2,3], k = 2 Output: [1,2] Example 2: Input: nums = [1], k = 1 Output: [1] Constraints: 1 <= nums.length <= 10 5-10 4 <= nums[i] <= 10 4; k is in the range [1, the number of unique elements in the array]. ; Each vowel 'e' may only be followed by an 'a' or an 'i'. Given the root of a complete binary tree, return the number of the nodes in the tree.. The following rules define a valid string:. 71.8%: Medium: 2182: Construct String With Repeat Limit. : //leetcode.com/problems/valid-parenthesis-string/ '' > count < /a > given an array of string words the conditions length can! ' i ' or an ' a ' or a ' u ' # 30 with! Case you have to count the repeated ones too that a sender is the total appeal of of! Given the conditions of 2 there is only 1 smaller element ( 1 ) a substring is a string. May be even mistakenly taken down by some companies, only solutions will be post on now is substring another. 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count prefix of a given string leetcode