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