Jan 20, 2018 best time to buy and sell stock ii multiple transaction, accumulate sectional profit, 26, 27, 283. This is one of facebooks favorite interview questions to ask. Given a string containing just the characters,, and, determine if the input string is valid. Given an array of citations each citation is a nonnegative integer of a researcher, write a function to compute the. If nothing happens, download github desktop and try again.
For example, in array 1, 2, 3, 1, 3 is a peak element and your function should return the index number 2. If found in the array return its index, otherwise return 1. Given an array of citations sorted in ascending order each citation is a nonnegative integer of a researcher, write a function to compute the researchers. Given a message and a timestamp in seconds granularity, return true if the message should be printed in the given timestamp, otherwise returns false. Feb 06, 2019 this is one of facebooks favorite interview questions to ask. Given an array of integers, find two nonoverlapping subarrays which have the largest sum. Jul 01, 2016 117 populating next right pointers in each node ii 32.
Given211045, tail connects to node index 1,return10. Binary tree postorder traversal breadth search first of tree leetcode 102. Your algorithm should run in linear runtime complexity. This is the best place to expand your knowledge and get prepared for your next interview. I started doing leetcode questions when i wanted to get better at competitive.
Could you implement it using only constant extra space complexity. Given an array of citations each citation is a nonnegative integer of a researcher, write a function to compute the researchers hindex. If not, return the index where it would be if it were inserted in order. Given an array of integers and an integer k, find out whether there are two distinct indices i and j in the array such that numsi numsj and the difference between i and j is at most k. Write a program to check whether a given number is an ugly number. Youd also have to be pretty good at faking the solving a novel problem. Given nums 5, 2, 6, 1 to the right of 5 there are 2 smaller elements 2 and 1. You are given two jugs with capacities x and y litres. Leetcode problems classified by company learn for master. Permutation index permutation index ii permutation sequence unique binary search trees ii.
Leetcode hindex java given an array of citations each citation is a nonnegative integer of a researcher, write a function to compute the researchers hindex. Design a logger system that receive stream of messages along with its timestamps, each message should be printed if and only if it is not printed in the last 10 seconds. For example, given citations 3, 0, 6, 1, 5, which means the researcher has 5 papers in total and each of them had received 3, 0, 6, 1, 5 citations respectively. Permutation index ii permutation sequence unique binary search trees ii palindrome partitioning. What if the citations array is sorted in ascending order. The right subtree of a node contains only nodes with keys greater than the nodes key. According to the definition of hindex on wikipedia. Elements of programming is a lot more comprehensive than cracking coding interview. Did you ever get frustrated reading bunch of books and blogs. The counts array has the property where countsi is the number of smaller elements to the right of numsi. Im not sure how they are compared to leetcoders book, i have. A string is good if it can be formed by characters from chars each character can only be used once.
Given an array containingndistinct numbers taken from0, 1, 2. Sep 20, 2016 for example, given citations 3, 0, 6, 1, 5, which means the researcher has 5 papers in total and each of them had received 3, 0, 6, 1, 5 citations respectively since the researcher has 3 papers with at least 3 citations each and the remaining two with no more than 3 citations each, his h index is. It helps to know whether your middle index formula is getting the lowermiddle or. For this problem, a heightbalanced binary tree is defined as a binary tree in which the depth of the two subtrees of every node never differ by more than 1. Permutation index ii given a permutation which may contain repeated numbers, find its index in all the permutations of these numbers, which are ordered in lexicographical order. Coding interviews decode ways leetcode question and explanation. Since the researcher has 3 papers with at least 3 citations each and the remaining two with no more than 3 citations each, his hindex is 3. Aug 07, 2017 the array may contain multiple peaks, in that case return the index to any one of the peaks is fine. Two sum ii input array is sorted reverse vowels of a string container with most water. Given a binary tree, determine if it is heightbalanced. Best time to buy and sell stock ii multiple transaction, accumulate sectional profit, 26, 27, 283. Leetcode permutations and permutations ii java life. Given an array of citations sorted in ascending order each citation is a nonnegative integer of a researcher, write a function to compute the researchers hindex. Contribute to erica8 leetcode development by creating an account on github.
Path sum ii flatten binary tree to linked list validate binary search tree recover binary search tree binary tree path sum root to leaf numbers dynamic programming best time to buy and sell stock. I think its enough to consider lc as the best platform for preparation to tech interviews. Math related problems on leetcode algorithms and coding. Problems coming from leetcode, lintcode, topcoder, ctci, etc. Pascals triangle ii given a nonnegative index k where k. Want to be notified of new releases in haoelleetcode. Permutation index ii permutation sequence unique binary search trees ii palindrome partitioning combinations combination sum. Level up your coding skills and quickly land a job. A scientist has index h if h of hisher n papers have at least h citations each, and the other n. Given a sorted array of integers nums and integer values a, b and c. Till right now, i have only mastered four types of problems. Contribute to zhang199096leetcode development by creating an account on github. This file file serves as your books preface, a great place to describe your books content and ideas.
Given a sorted array and a target value, return the index if the target is found. Given an array of citations sorted in ascending order each citation is a non negative integer of a researcher, write a function to compute the researchers. Given a linked list, return the node where the cycle begins. Count of smaller numbers after self algorithms collection. There is an infinite amount of water supply available.
The left subtree of a node contains only nodes with keys less than the nodes key. Ugly numbers are positive numbers whose prime factors only include 2, 3, 5. Leetcode you are given an array of strings words and a string chars. You are given an integer array nums and you have to return a new counts array. Summary ranges given a sorted integer array without duplicates, return the summary of its ranges. I use ep to practice, and cci for a quick interview prep. Facebook coding interview question decode ways leetcode. For coding interview preparation, leetcode is one of the best online resource providing a rich library of. You need to determine whether it is possible to measure exactly z litres using these two jugs.
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