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