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