To the right of 2 there is only 1 smaller element (1). You need to find the number of good triplets. 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. Note that a sender may send more than one message. #14 Longest Common Prefix. A substring is a contiguous sequence of characters within a string. The word count of a sender is the total number of words sent by the sender. You are given an integer n, the number of teams in a tournament that has strange rules:. A substring is a contiguous sequence of characters within a string. Node 4 -> (3,4) is the maximum value in the path starting from the R.I.P. Given a sorted array of distinct integers and a target value, return the index if the target is found. 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. The count-and-say sequence is a sequence of digit strings defined by the recursive formula:. A substring is a contiguous sequence of characters within a string. 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. Example 1: Input: root = [3,1,4,3,null,1,5] Output: 4 Explanation: Nodes in blue are good.Root Node (3) is always a good node. ; Each vowel 'e' may only be followed by an 'a' or an 'i'. Return all strings in words which is substring of another word in any order. #28 Find the Index of the First Occurrence in a String. A triplet (arr[i], arr[j], arr[k]) is good if the following conditions are true: Example 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. In other words, return true if one of s1's permutations is the substring of s2. Easy #15 3Sum. R.I.P. Given a string s, find the first non-repeating character in it and return its index.If it does not exist, return -1.. ; Each vowel 'e' may only be followed by an 'a' or an 'i'. 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. In other words, return true if one of s1's permutations is the substring of s2. You have a chat log of n messages. 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). 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, find the first non-repeating character in it and return its index.If it does not exist, return -1.. Medium #29 Divide Two Integers. Omit all the empty parenthesis pairs that do not affect the one-to-one mapping relationship Given an integer array nums, return an integer array counts where counts[i] is the number of smaller elements to the right of nums[i].. LeetCode is hiring! You are given an integer n, the number of teams in a tournament that has strange rules:. You are given a string array words and a string s, where words[i] and s comprise only of lowercase English letters. 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. Given an array of integers arr, and three integers a, b and c. You need to find the number of good triplets. R.I.P. Any left parenthesis '(' must have a corresponding right parenthesis ')'. 2231 169 Add to List Share. 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. Example 1: Given the head of a linked list, return the list after sorting it in ascending order.. Given an integer array nums and an integer k, return the k most frequent elements.You may return the answer in any order.. ; Any right parenthesis ')' must have a corresponding left parenthesis '('. Example 2: Input: s = "mbadm" Given the root of a complete binary tree, return the number of the nodes in the tree.. Return the minimum number of steps to make s palindrome.. A Palindrome String is one that reads the same backward as well as forward.. Any cells outside of the grid are considered water cells. Given an array of integers nums and an integer k. A continuous subarray is called nice if there are k odd numbers on it. Example 1: ; Each vowel 'o' may only be followed by an 'i' or a 'u'. 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. 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 The word count of a sender is the total number of words sent by the sender. 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.. ; Each vowel 'o' may only be followed by an 'i' or a 'u'. Return the number of nice sub-arrays. #14 Longest Common Prefix. Example 1: Counting Words With a Given Prefix. 77.1%: Easy: 2186: Minimum Number of Steps to Make Two Strings Anagram II. #14 Longest Common Prefix. Medium #29 Divide Two Integers. Example 1: Input: nums = [4,1,3,3] Output: 5 Explanation: The pair (0, 1) is a bad pair since 1 - 0 != 1 - 4. ; Each vowel 'i' may not be followed by another 'i'. ; Each vowel 'o' may only be followed by an 'i' or a 'u'. Each character is a lower case vowel ('a', 'e', 'i', 'o', 'u')Each vowel 'a' may only be followed by an 'e'. Easy #15 3Sum. 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]. 77.1%: Easy: 2186: Minimum Number of Steps to Make Two Strings Anagram II. A triplet (arr[i], arr[j], arr[k]) is good if the following conditions are true: Hard #31 Next Permutation. Given an array of integers arr, and three integers a, b and c. You need to find the number of good triplets. Return the number of teams you can form given the conditions. 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. 2231 169 Add to List Share. 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.. Given a string s containing only three types of characters: '(', ')' and '*', return true if s is valid.. 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). Given an array of string words. Counting Words With a Given Prefix. 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". Return the number of teams you can form given the conditions. Given a string s containing only three types of characters: '(', ')' and '*', return true if s is valid.. 73.3%: Easy: 2224: Minimum Number of Operations to Convert Time. Given two strings s1 and s2, return true if s2 contains a permutation of s1, or false otherwise. 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). Counting Words With a Given Prefix. Given an integer n, your task is to count how many strings of length n can be formed under the following rules:. ; If the current number of teams is odd, one team randomly advances in the tournament, and the rest gets paired. Given an integer n, your task is to count how many strings of length n can be formed under the following rules:. 65.3%: Easy: Medium #16 3Sum Closest. Medium #16 3Sum Closest. Given a string s, return the total appeal of all of its substrings. Medium #29 Divide Two Integers. Return all strings in words which is substring of another word in any order. 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. Given an array of integers nums and an integer k. A continuous subarray is called nice if there are k odd numbers on it. Count Number of Teams. Medium. To the right of 6 there is 1 smaller element (1). Given two strings s1 and s2, return true if s2 contains a permutation of s1, or false otherwise. Omit all the empty parenthesis pairs that do not affect the one-to-one mapping relationship You are given a 0-indexed integer array nums.A pair of indices (i, j) is a bad pair if i < j and j - i != nums[j] - nums[i].. Return the total number of bad pairs in nums.. To determine how you "say" a digit string, split it into the minimal number of substrings such that each substring To the right of 2 there is only 1 smaller element (1). 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]. The following rules define a valid string:. Since free questions may be even mistakenly taken down by some companies, only solutions will be post on now. 65.3%: Easy: To the right of 6 there is 1 smaller element (1). 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). Note that a sender may send more than one message. Each character is a lower case vowel ('a', 'e', 'i', 'o', 'u')Each vowel 'a' may only be followed by an 'e'. 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.. Hard #31 Next Permutation. Given a string s, find the first non-repeating character in it and return its index.If it does not exist, return -1.. ; Left parenthesis '(' must go before the corresponding right parenthesis ')'. ; If the current number of teams is odd, one team randomly advances in the tournament, and the rest gets paired. Given an array of string words. Since free questions may be even mistakenly taken down by some companies, only solutions will be post on now. (soldiers can be part of multiple teams). You are given an integer n, the number of teams in a tournament that has strange rules:. 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). LeetCode is hiring! You are given an undirected graph defined by an integer n, the number of nodes, and a 2D integer array edges, the edges in the graph, where edges[i] = [u i, v i] indicates that there is an undirected edge between u i and v i.You are also given an integer array queries.. Let incident(a, b) be defined as the number of edges that are connected to either node a or b. Easy #15 3Sum. 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.. Notice that some substrings can be repeated so in this case you have to count the repeated ones too. Example 1: #28 Find the Index of the First Occurrence in a String. (soldiers can be part of multiple teams). 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. Example 1: Input: nums = [10,9,2,5,3,7,101,18] Output: 4 Explanation: Given the head of a linked list, return the list after sorting it in ascending order.. 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 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". Notice that some substrings can be repeated so in this case you have to count the repeated ones too. 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. For example, the appeal of "abbca" is 3 because it has 3 distinct characters: 'a', 'b', and 'c'. Given a string s, return the total appeal of all of its substrings. Return the number of nice sub-arrays. A substring is a contiguous sequence of characters within a string. Each character is a lower case vowel ('a', 'e', 'i', 'o', 'u')Each vowel 'a' may only be followed by an 'e'. 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 an undirected graph defined by an integer n, the number of nodes, and a 2D integer array edges, the edges in the graph, where edges[i] = [u i, v i] indicates that there is an undirected edge between u i and v i.You are also given an integer array queries.. Let incident(a, b) be defined as the number of edges that are connected to either node a or b. Example 1: Input: nums = [4,1,3,3] Output: 5 Explanation: The pair (0, 1) is a bad pair since 1 - 0 != 1 - 4. You are given a string array words and a string s, where words[i] and s comprise only of lowercase English letters. If the length of the string is > 1, do the following: Split the string into two non-empty substrings at a random index, i.e., if the string is s, divide it to x and y where s = x + y. Example 1: Input: root = [3,1,4,3,null,1,5] Output: 4 Explanation: Nodes in blue are good.Root Node (3) is always a good node. We can scramble a string s to get a string t using the following algorithm: If the length of the string is 1, stop. Example 1: Any left parenthesis '(' must have a corresponding right parenthesis ')'. For example, the appeal of "abbca" is 3 because it has 3 distinct characters: 'a', 'b', and 'c'. 71.8%: Medium: 2182: Construct String With Repeat Limit. ; Each vowel 'i' may not be followed by another 'i'. Given a string s.In one step you can insert any character at any index of the string. You are given a 0-indexed integer array nums.A pair of indices (i, j) is a bad pair if i < j and j - i != nums[j] - nums[i].. Return the total number of bad pairs in nums.. 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: nums = [1,1,2,1,1], k = 3 Output: 2 Explanation: The only sub-arrays with Example 2: Input: s = "mbadm" Note that a sender may send more than one message. A substring is a contiguous sequence of characters within a string. Given an integer array nums and an integer k, return the k most frequent elements.You may return the answer in any order.. The word count of a sender is the total number of words sent by the sender. Node 4 -> (3,4) is the maximum value in the path starting from the 65.3%: Easy: Given an integer array nums, return an integer array counts where counts[i] is the number of smaller elements to the right of nums[i].. 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. Return true if s is a prefix string of words, or false otherwise. Example 1: Any cells outside of the grid are considered water cells. Return the minimum number of steps to make s palindrome.. A Palindrome String is one that reads the same backward as well as forward.. 71.8%: Medium: 2182: Construct String With Repeat Limit. Medium #16 3Sum Closest. In other words, return true if one of s1's permutations is the substring of s2. Medium #29 Divide Two Integers. Example 1: Input: s = "zzazz" Output: 0 Explanation: The string "zzazz" is already palindrome we do not need any insertions. 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". You have a chat log of n messages. Example 1: Input: s = "zzazz" Output: 0 Explanation: The string "zzazz" is already palindrome we do not need any insertions. ; Each vowel 'i' may not be followed by another 'i'. For example, [3,6,2,7] is a subsequence of the array [0,3,1,6,2,2,7]. The appeal of a string is the number of distinct characters found in the string. Given an integer array nums, return the length of the longest strictly increasing subsequence.. A subsequence is a sequence that can be derived from an array by deleting some or no elements without changing the order of the remaining elements. Example 1: Given a string s containing only three types of characters: '(', ')' and '*', return true if s is valid.. Given a sorted array of distinct integers and a target value, return the index if the target is found. If the length of the string is > 1, do the following: Split the string into two non-empty substrings at a random index, i.e., if the string is s, divide it to x and y where s = x + y. 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 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.. ; Left parenthesis '(' must go before the corresponding right parenthesis ')'. Count Prefixes of a Given String. 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. 2231 169 Add to List Share. Given an integer array nums, return an integer array counts where counts[i] is the number of smaller elements to the right of nums[i].. Medium #30 Substring with Concatenation of All Words. ; Any right parenthesis ')' must have a corresponding left parenthesis '('. The pair (0, 2) is a bad pair since 2 - 0 != 3 - 4, 2 != -1. Example 1: Input: nums = [5,2,6,1] Output: [2,1,1,0] Explanation: To the right of 5 there are 2 smaller elements (2 and 1). Node 4 -> (3,4) is the maximum value in the path starting from the Given a string s.In one step you can insert any character at any index of the 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]. 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. 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"). Given a string s and an array of strings words, determine whether s is a prefix string of words. Example 1: Input: root = [3,1,4,3,null,1,5] Output: 4 Explanation: Nodes in blue are good.Root Node (3) is always a good node. To the right of 6 there is 1 smaller element (1). 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. Example 1: Given the head of a linked list, return the list after sorting it in ascending order.. 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. 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). Medium #17 Letter Combinations of a Phone Number. Given a sorted array of distinct integers and a target value, return the index if the target is found. The appeal of a string is the number of distinct characters found in the string. You have a chat log of n messages. If the length of the string is > 1, do the following: Split the string into two non-empty substrings at a random index, i.e., if the string is s, divide it to x and y where s = x + y. Since free questions may be even mistakenly taken down by some companies, only solutions will be post on now. LeetCode is hiring! Count Number of Teams. Example 1: Input: nums = [10,9,2,5,3,7,101,18] Output: 4 Explanation: Medium #30 Substring with Concatenation of All Words. We can scramble a string s to get a string t using the following algorithm: If the length of the string is 1, stop. Example 1: Input: nums = [5,2,6,1] Output: [2,1,1,0] Explanation: To the right of 5 there are 2 smaller elements (2 and 1). Count Prefixes of a Given String. Return the number of teams you can form given the conditions. Return the number of nice sub-arrays. 73.3%: Easy: 2224: Minimum Number of Operations to Convert Time. Given two strings s1 and s2, return true if s2 contains a permutation of s1, or false otherwise. Medium #17 Letter Combinations of a Phone Number. 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 also given a 2D integer array points where points[j] = [x j, y j] is a point with coordinates (x j, y j). String words[i] is substring of words[j], if can be obtained removing some characters to left and/or right side of words[j]. Example 1: Input: s = "zzazz" Output: 0 Explanation: The string "zzazz" is already palindrome we do not need any insertions. The following rules define a valid string:. 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. Example 1: #28 Find the Index of the First Occurrence in a String. 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.. 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: 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. Given a string s, return the total appeal of all of its substrings. Return all strings in words which is substring of another word in any order. 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. To the right of 2 there is only 1 smaller element (1). Return the minimum number of steps to make s palindrome.. A Palindrome String is one that reads the same backward as well as forward.. Count Number of Teams. Medium #29 Divide Two Integers. Return true if s is a prefix string of words, or false otherwise. 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. Given an integer array nums and an integer k, return the k most frequent elements.You may return the answer in any order.. 77.1%: Easy: 2186: Minimum Number of Steps to Make Two Strings Anagram II. 73.3%: Easy: 2224: Minimum Number of Operations to Convert Time. Given a string s and an array of strings words, determine whether s is a prefix string of words. Given the root of a complete binary tree, return the number of the nodes in the tree.. You need to find the number of good triplets. Example 1: Input: nums = [4,1,3,3] Output: 5 Explanation: The pair (0, 1) is a bad pair since 1 - 0 != 1 - 4. Example 2: Input: s = "mbadm" ; If the current number of teams is odd, one team randomly advances in the tournament, and the rest gets paired. Medium #29 Divide Two Integers. For example, [3,6,2,7] is a subsequence of the array [0,3,1,6,2,2,7]. A triplet (arr[i], arr[j], arr[k]) is good if the following conditions are true: 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]. Medium. 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. 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.. Example 1: #28 Find the Index of the First Occurrence in a String. 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