You are given a string array words and a string s, where words[i] and s comprise only of lowercase English letters. to my old Leetcode repository, where there were 5.7k+ stars and 2.2k+ forks (ever the top 3 in the field). 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 Medium #29 Divide Two Integers. Return true if s is a prefix string of words, or false otherwise. 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). 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 a string s containing only three types of characters: '(', ')' and '*', return true if s is valid.. You need to find the number of good triplets. 2231 169 Add to List Share. Example 1: Input: s1 = "ab", s2 = "eidbaooo" Output: true Explanation: s2 contains one permutation of s1 ("ba"). Hard #31 Next Permutation. 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. 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. 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.. 73.3%: Easy: 2224: Minimum Number of Operations to Convert Time. To the right of 2 there is only 1 smaller element (1). Any cells outside of the grid are considered water cells. Any left parenthesis '(' must have a corresponding right parenthesis ')'. ; Left parenthesis '(' must go before the corresponding right parenthesis ')'. Given an array of integers arr, and three integers a, b and c. You need to find the number of good triplets. Given a string s.In one step you can insert any character at any index of the string. A triplet (arr[i], arr[j], arr[k]) is good if the following conditions are true: Example 1: 2231 169 Add to List Share. 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. For example, the appeal of "abbca" is 3 because it has 3 distinct characters: 'a', 'b', and 'c'. Medium #17 Letter Combinations of a Phone Number. Medium. ; Each vowel 'o' may only be followed by an 'i' or a 'u'. String words[i] is substring of words[j], if can be obtained removing some characters to left and/or right side of words[j]. A triplet (arr[i], arr[j], arr[k]) is good if the following conditions are true: 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". A substring is a contiguous sequence of characters within a string. LeetCode is hiring! Given the root of a complete binary tree, return the number of the nodes in the tree.. Hard #31 Next Permutation. You are given an integer n, the number of teams in a tournament that has strange rules:. Given an array of string words. 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. Return the minimum number of steps to make s palindrome.. A Palindrome String is one that reads the same backward as well as forward.. Example 1: The appeal of a string is the number of distinct characters found in the string. (soldiers can be part of multiple teams). Node 4 -> (3,4) is the maximum value in the path starting from the 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 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. 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 the number of nice sub-arrays. Omit all the empty parenthesis pairs that do not affect the one-to-one mapping relationship 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. ; Each vowel 'i' may not be followed by another 'i'. In other words, return true if one of s1's permutations is the substring of s2. 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. Example 1: Input: nums = [10,9,2,5,3,7,101,18] Output: 4 Explanation: Medium #17 Letter Combinations of a Phone Number. 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 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.. 73.3%: Easy: 2224: Minimum Number of Operations to Convert Time. Medium #29 Divide Two Integers. Example 1: #28 Find the Index of the First Occurrence in a String. R.I.P. 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 To determine how you "say" a digit string, split it into the minimal number of substrings such that each substring Notice that some substrings can be repeated so in this case you have to count the repeated ones too. Given a string s, return the total appeal of all of its substrings. ; Each vowel 'i' may not be followed by another 'i'. Note that a sender may send more than one message. 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 ; If the current number of teams is odd, one team randomly advances in the tournament, and the rest gets paired. We can scramble a string s to get a string t using the following algorithm: If the length of the string is 1, stop. Return the number of teams you can form given the conditions. R.I.P. Counting Words With a Given Prefix. Example 1: Input: nums = [1,1,2,1,1], k = 3 Output: 2 Explanation: The only sub-arrays with Given the head of a linked list, return the list after sorting it in ascending order.. A triplet (arr[i], arr[j], arr[k]) is good if the following conditions are true: Node 4 -> (3,4) is the maximum value in the path starting from the Example 1: Input: nums = [10,9,2,5,3,7,101,18] Output: 4 Explanation: Given a string s, find the first non-repeating character in it and return its index.If it does not exist, return -1.. 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.. ; Each vowel 'o' may only be followed by an 'i' or a 'u'. Given the root of a complete binary tree, return the number of the nodes in the tree.. Count Number of Teams. Given a string s and an array of strings words, determine whether s is a prefix string of words. Medium #29 Divide Two Integers. Return true if s is a prefix string of words, or false otherwise. Given an array of string words. Example 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). For example, the appeal of "abbca" is 3 because it has 3 distinct characters: 'a', 'b', and 'c'. ; If the current number of teams is odd, one team randomly advances in the tournament, and the rest gets paired. #28 Find the Index of the First Occurrence in a String. 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. In other words, return true if one of s1's permutations is the substring of s2. You have a chat log of n messages. You are given a string array words and a string s, where words[i] and s comprise only of lowercase English letters. Example 1: Input: s = "zzazz" Output: 0 Explanation: The string "zzazz" is already palindrome we do not need any insertions. (soldiers can be part of multiple teams). ; Any right parenthesis ')' must have a corresponding left parenthesis '('. Since free questions may be even mistakenly taken down by some companies, only solutions will be post on now. to my old Leetcode repository, where there were 5.7k+ stars and 2.2k+ forks (ever the top 3 in the field). Given a string s.In one step you can insert any character at any index of the string. ; Each vowel 'e' may only be followed by an 'a' or an 'i'. For example, [3,6,2,7] is a subsequence of the array [0,3,1,6,2,2,7]. Count Number of Teams. You are given a string array words and a string s, where words[i] and s comprise only of lowercase English letters. String words[i] is substring of words[j], if can be obtained removing some characters to left and/or right side of words[j]. 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'. Medium #17 Letter Combinations of a Phone Number. 77.1%: Easy: 2186: Minimum Number of Steps to Make Two Strings Anagram II. Given a sorted array of distinct integers and a target value, return the index if the target is found. Example 1: Example 1: ; Any right parenthesis ')' must have a corresponding left parenthesis '('. Any cells outside of the grid are considered water cells. You have a chat log of n messages. 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). ; Each vowel 'e' may only be followed by an 'a' or an 'i'. Notice that some substrings can be repeated so in this case you have to count the repeated ones too. 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]. Example 1: 65.3%: Easy: Given the head of a linked list, return the list after sorting it in ascending order.. Example 1: To the right of 6 there is 1 smaller element (1). ; Each vowel 'o' may only be followed by an 'i' or a 'u'. 65.3%: Easy: Return the minimum number of steps to make s palindrome.. A Palindrome String is one that reads the same backward as well as forward.. Medium #29 Divide Two Integers. 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.. 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 a string s containing only three types of characters: '(', ')' and '*', return true if s is valid.. 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 an integer array nums and an integer k, return the k most frequent elements.You may return the answer in any order.. The count-and-say sequence is a sequence of digit strings defined by the recursive formula:. 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). 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 two strings s1 and s2, return true if s2 contains a permutation of s1, or false otherwise. The appeal of a string is the number of distinct characters found in the 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. Omit all the empty parenthesis pairs that do not affect the one-to-one mapping relationship 71.8%: Medium: 2182: Construct String With Repeat Limit. (soldiers can be part of multiple teams). Given a string s, return the total appeal of all of its substrings. 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. For example, [3,6,2,7] is a subsequence of the array [0,3,1,6,2,2,7]. 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 an integer n, your task is to count how many strings of length n can be formed under the following rules:. Example 1: In other words, return true if one of s1's permutations is the substring of s2. Given an array of string words. Count Prefixes of a Given String. Given two strings s1 and s2, return true if s2 contains a permutation of s1, or false otherwise. To the right of 2 there is only 1 smaller element (1). 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 1: Given an array of integers nums and an integer k. A continuous subarray is called nice if there are k odd numbers on it. Return the number of teams you can form given the conditions. Example 1: Since free questions may be even mistakenly taken down by some companies, only solutions will be post on now. 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. Medium #29 Divide Two Integers. 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. Notice that some substrings can be repeated so in this case you have to count the repeated ones too. 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. Return all strings in words which is substring of another word in any order. Example 1: Input: s1 = "ab", s2 = "eidbaooo" Output: true Explanation: s2 contains one permutation of s1 ("ba"). Example 2: Input: s = "mbadm" To the right of 6 there is 1 smaller element (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.. Omit all the empty parenthesis pairs that do not affect the one-to-one mapping relationship Example 1: 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. A substring is a contiguous sequence of characters within a string. 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). 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. 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: 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. Given an integer array nums and an integer k, return the k most frequent elements.You may return the answer 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. Return all strings in words which is substring of another word in any order. Count Prefixes of a Given String. Example 1: Medium. Medium #30 Substring with Concatenation of All Words. 2231 169 Add to List Share. For example, [3,6,2,7] is a subsequence of the array [0,3,1,6,2,2,7]. You have a chat log of n messages. The following rules define a valid string:. #28 Find the Index of the First Occurrence in a String. ; Left parenthesis '(' must go before the corresponding right parenthesis ')'. Given a string s and an array of strings words, determine whether s is a prefix string of words. Each character is a lower case vowel ('a', 'e', 'i', 'o', 'u')Each vowel 'a' may only be followed by an 'e'. 71.8%: Medium: 2182: Construct String With Repeat Limit. Given an array of integers nums and an integer k. A continuous subarray is called nice if there are k odd numbers on it. Given a string s, return the total appeal of all of its substrings. 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: s1 = "ab", s2 = "eidbaooo" Output: true Explanation: s2 contains one permutation of s1 ("ba"). The pair (0, 2) is a bad pair since 2 - 0 != 3 - 4, 2 != -1. The appeal of a string is the number of distinct characters found in the string. Given two strings s1 and s2, return true if s2 contains a permutation of s1, or false otherwise. The word count of a sender is the total number of words sent by the sender. 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. The count-and-say sequence is a sequence of digit strings defined by the recursive formula:. For example, the appeal of "abbca" is 3 because it has 3 distinct characters: 'a', 'b', and 'c'. The following rules define a valid string:. 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 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". Given a string s, find the first non-repeating character in it and return its index.If it does not exist, return -1.. 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, 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. 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].. #14 Longest Common Prefix. 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. Easy #15 3Sum. 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 a string s and an array of strings words, determine whether s is a prefix string of words. 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 2: Input: s = "mbadm" You are given an integer n, the number of teams in a tournament that has strange rules:. 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. 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! LeetCode is hiring! Note that a sender may send more than one message. 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). A substring is a contiguous sequence of characters within a string. Return the number of nice sub-arrays. R.I.P. Medium #29 Divide Two Integers. Given an integer n, your task is to count how many strings of length n can be formed under the following rules:. You are given an integer n, the number of teams in a tournament that has strange rules:. 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.. Given a sorted array of distinct integers and a target value, return the index if the target is found. The following rules define a valid string:. Example 1: Input: nums = [1,1,2,1,1], k = 3 Output: 2 Explanation: The only sub-arrays with 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.. ; Any right parenthesis ')' must have a corresponding left parenthesis '('. Given a string s containing only three types of characters: '(', ')' and '*', return true if s is valid.. Given the root of a complete binary tree, return the number of the nodes in the tree.. ; If the current number of teams is odd, one team randomly advances in the tournament, and the rest gets paired. 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. 65.3%: Easy: 73.3%: Easy: 2224: Minimum Number of Operations to Convert Time. Counting Words With a Given Prefix. Example 1: Input: nums = [4,1,3,3] Output: 5 Explanation: The pair (0, 1) is a bad pair since 1 - 0 != 1 - 4. Given a string s.In one step you can insert any character at any index of the string. Example 1: Input: nums = [1,1,2,1,1], k = 3 Output: 2 Explanation: The only sub-arrays with Given an integer n, your task is to count how many strings of length n can be formed under the following rules:. Return the minimum number of steps to make s palindrome.. A Palindrome String is one that reads the same backward as well as forward.. to my old Leetcode repository, where there were 5.7k+ stars and 2.2k+ forks (ever the top 3 in the field). 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). Easy #15 3Sum. 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". 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: 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'. 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. We can scramble a string s to get a string t using the following algorithm: If the length of the string is 1, stop. Medium #16 3Sum Closest. Given a sorted array of distinct integers and a target value, return the index if the target is found. 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]. Node 4 -> (3,4) is the maximum value in the path starting from the 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. 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. The word count of a sender is the total number of words sent by the sender. Medium #16 3Sum Closest. 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. 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. Example 1: Input: nums = [10,9,2,5,3,7,101,18] Output: 4 Explanation: To determine how you "say" a digit string, split it into the minimal number of substrings such that each substring The word count of a sender is the total number of words sent by the sender. 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). Each character is a lower case vowel ('a', 'e', 'i', 'o', 'u')Each vowel 'a' may only be followed by an 'e'. 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. 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: root = [3,1,4,3,null,1,5] Output: 4 Explanation: Nodes in blue are good.Root Node (3) is always a good node. 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 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].. 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