count prefix of a given string leetcode

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