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. The pair (0, 2) is a bad pair since 2 - 0 != 3 - 4, 2 != -1. Example 1: Input: nums = [1,1,2,1,1], k = 3 Output: 2 Explanation: The only sub-arrays with Example 1: ; Any right parenthesis ')' must have a corresponding left parenthesis '('. Given a string s.In one step you can insert any character at any index of the 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.. Medium #30 Substring with Concatenation of All Words. Example 1: Input: s1 = "ab", s2 = "eidbaooo" Output: true Explanation: s2 contains one permutation of s1 ("ba"). Return true if s is a prefix string of words, or false otherwise. 71.8%: Medium: 2182: Construct String With Repeat Limit. Notice that some substrings can be repeated so in this case you have to count the repeated ones too. 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. The word count of a sender is the total number of words sent by the sender. 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. For example, the appeal of "abbca" is 3 because it has 3 distinct characters: 'a', 'b', and 'c'. To the right of 2 there is only 1 smaller element (1). Medium #17 Letter Combinations of a Phone Number. Given the head of a linked list, return the list after sorting it in ascending order.. Node 4 -> (3,4) is the maximum value in the path starting from the To the right of 6 there is 1 smaller element (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 minimum number of steps to make s palindrome.. A Palindrome String is one that reads the same backward as well as forward.. Given a string s containing only three types of characters: '(', ')' and '*', return true if s is valid.. 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 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: #28 Find the Index of the First Occurrence in a String. #14 Longest Common Prefix. A triplet (arr[i], arr[j], arr[k]) is good if the following conditions are true: (soldiers can be part of multiple teams). 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. Medium #29 Divide Two Integers. 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. Return the number of strings in words that are a prefix of s. A prefix of a string is a substring that occurs at the beginning of the string. Example 1: Input: 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: The following rules define a valid string:. 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 two strings s1 and s2, return true if s2 contains a permutation of s1, or false otherwise. 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 and an array of strings words, determine whether s is a prefix string of words. Medium #29 Divide Two Integers. Given an array of string words. ; If the current number of teams is odd, one team randomly advances in the tournament, and the rest gets paired. Return the number of nice sub-arrays. Medium #29 Divide Two Integers. Medium. 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 sorted array of distinct integers and a target value, return the index if the target is found. Any left parenthesis '(' must have a corresponding right parenthesis ')'. LeetCode is hiring! We can scramble a string s to get a string t using the following algorithm: If the length of the string is 1, stop. Given an array of integers arr, and three integers a, b and c. You need to find the number of good triplets. The appeal of a string is the number of distinct characters found in the string. Example 1: Input: nums = [1,1,1,2,2,3], k = 2 Output: [1,2] Example 2: Input: nums = [1], k = 1 Output: [1] Constraints: 1 <= nums.length <= 10 5-10 4 <= nums[i] <= 10 4; k is in the range [1, the number of unique elements in the array]. 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.. Given a sorted array of distinct integers and a target value, return the index if the target is found. 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. to my old Leetcode repository, where there were 5.7k+ stars and 2.2k+ forks (ever the top 3 in the field). Given an integer n, your task is to count how many strings of length n can be formed under the following rules:. Medium #16 3Sum Closest. Hard #31 Next Permutation. ; Each vowel 'i' may not be followed by another 'i'. Any cells outside of the grid are considered water cells. 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.. 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. 73.3%: Easy: 2224: Minimum Number of Operations to Convert Time. For example, [3,6,2,7] is a subsequence of the array [0,3,1,6,2,2,7]. 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 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 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 an integer array nums and an integer k, return the k most frequent elements.You may return the answer in any order.. Any cells outside of the grid are considered water cells. Example 1: Count Number of Teams. 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 #17 Letter Combinations of a Phone Number. 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. The count-and-say sequence is a sequence of digit strings defined by the recursive formula:. Example 1: Input: head = [1,1,2] Output: [1,2] Example 2: Input: head = [1,1,2,3,3] Output: [1,2,3] Constraints: The number of nodes in the list is in the range [0, 300].-100 <= Node.val <= 100; The list is guaranteed to be sorted in ascending order. Given a 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 are given an integer n, the number of teams in a tournament that has strange rules:. 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].. 71.8%: Medium: 2182: Construct String With Repeat Limit. Example 1: Input: nums = [4,1,3,3] Output: 5 Explanation: The pair (0, 1) is a bad pair since 1 - 0 != 1 - 4. ; Left parenthesis '(' must go before the corresponding right parenthesis ')'. 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. The count-and-say sequence is a sequence of digit strings defined by the recursive formula:. The appeal of a string is the number of distinct characters found in the string. Easy #15 3Sum. Medium #29 Divide Two Integers. 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. 73.3%: Easy: 2224: Minimum Number of Operations to Convert Time. Example 1: Input: nums = [1,1,2,1,1], k = 3 Output: 2 Explanation: The only sub-arrays with Medium #30 Substring with Concatenation of All Words. Node 4 -> (3,4) is the maximum value in the path starting from the To the right of 2 there is only 1 smaller element (1). Notice that some substrings can be repeated so in this case you have to count the repeated ones too. 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. #14 Longest Common Prefix. Example 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 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. 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 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.. Note that a sender may send more than one message. Example 1: Input: nums = [10,9,2,5,3,7,101,18] Output: 4 Explanation: For example, the appeal of "abbca" is 3 because it has 3 distinct characters: 'a', 'b', and 'c'. Example 1: Given the root of a complete binary tree, return the number of the nodes in the tree.. 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: #28 Find the Index of the First Occurrence in a String. Medium #30 Substring with Concatenation of All Words. 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. Medium. 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 an integer array counts where counts[i] is the number of smaller elements to the right of nums[i].. 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. Hard #31 Next Permutation. 65.3%: Easy: Count Prefixes of a Given String. 65.3%: Easy: Return true if s is a prefix string of words, or false otherwise. You have a chat log of n messages. You need to find the number of good triplets. Given the root of a complete binary tree, return the number of the nodes in the tree.. Example 1: Input: s = "zzazz" Output: 0 Explanation: The string "zzazz" is already palindrome we do not need any insertions. Given a string s containing only three types of characters: '(', ')' and '*', return true if s is valid.. 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). ; 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. ; Any right parenthesis ')' must have a corresponding left parenthesis '('. A substring is a contiguous sequence of characters within a string. 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 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: ; Each vowel 'i' may not be followed by another 'i'. 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 teams you can form given the conditions. You have a chat log of n messages. 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.In one step you can insert any character at any index of the string. Each character is a lower case vowel ('a', 'e', 'i', 'o', 'u')Each vowel 'a' may only be followed by an 'e'. 77.1%: Easy: 2186: Minimum Number of Steps to Make Two Strings Anagram II. Example 2: Input: s = "mbadm" Given the head of a linked list, return the list after sorting it in ascending order.. 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: 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 an array of integers nums and an integer k. A continuous subarray is called nice if there are k odd numbers on it. 77.1%: Easy: 2186: Minimum Number of Steps to Make Two Strings Anagram II. 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