You may assume that each input would have exactly one solution. Excluding all those subarrays from current subarray, gives new subarrays having desired sum. More efficient method of finding minimum sum after k. Find all possible k integers where their sum is target. Given n unique integers, number k 1 k k integers where their sum is target. Given an integer array, find the top k largest numbers. From the map find number of subarrays previously found having sum equal to currsum sum. Combination sum given a set of candidate numbers c and a target number t, find all unique combinations in c where the candidate numbers sums to t. Given an array of n integers nums and a target, find the number of index triplets i, j, k with 0 k k leetcode development by creating an account on github. Copy books 437 maximum gap 400 longest common subsequence 77. Binary tree path sum lintcode description given a binary tree, find all paths that sum of the nodes in the path equals to a given number target.
Search by constructing subset sums accepted intuition. For each number in nums, well check whether putting it in the ith. The range of numbers in the array is, and the range of the integer k is. The same repeated number may be chosen from c unlimited number of times. Given an array a of integer with size of n means n books and number of pages of each book and k people to copy the book. Its possible to divide it into 4 subsets 5, 1, 4, 2,3, 2,3 with equal sums. Like weve discussed before, this time, it is about three sum, also known as 3sum, one of variation of k sum problem in leetcode. Given n distinct positive integers, integer k k k numbers where sum is target. Contribute to hackerer leetcode development by creating an account on github.
Given two integers n and k, return all possible combinations of k numbers out of 1. Given a set of candidate numbers c and a target number t, find all unique combinations in c where the candidate numbers sums to t. The value of currsum exceeds desired sum by currsum sum. Introduction 001 two sum 002 add two numbers 003 longest substring without repeating characters 004 median of two sorted arrays 005 longest palindromic substring 006 zigzag conversion. Given an integer array, find the top k largest numbers in it. Merge k sorted arrays 486 continuous subarray sum 402 continuous subarray sum ii 403 largest rectangle in histogram 122 rotate array leetcode 189 linked list.
As even when k 2, the problem is a subset sum problem which is known to be nphard, and because the given input limits are low, our solution will focus on exhaustive search a natural approach is to simulate the k groups disjoint subsets of nums. Introduction linked list sort list merge two sorted lists merge k sorted lists linked list cycle. To avoid duplicate, we can take advantage of sorted arrays. Find file copy path fetching contributors cannot retrieve contributors at this time. Sum root to leaf numbers given a binary tree containing digits from 09 only, each roottoleaf path could represent a number an example is the roottoleaf path 123 which represents the number 123. An array is manipulated k times so that each time the max value is devided by 2 and rounded up. Sum root to leaf numbers given a binary tree containing digits from 09 only, each roottoleaf path could represent a number an example is the roottoleaf path 123 which represents the number 123 find the total sum of all roottoleaf numbers.
Zigzag conversion the string paypalishiring is written in a zigzag pattern on a given number of rows like this. Given an array nums and a target value k, find the maximum length of a subarray that sums to k. Refer this post for more explanation based on ctci book. Elements of programming is a lot more comprehensive than cracking coding interview. Given an array of integers, return indices of the two numbers such that they add up to a specific target. Did you ever get frustrated reading bunch of books and blogs revealing you the. Shortest subarray with sum at least k leetcode level up your coding skills and quickly land a job. Subarray sum equals k leetcode 30 day challenge day 22. Had my on site interviews at amazon and today the recruiter told me that i will get a job offer. With c 0 2 at p 0, p 6, it indicates 22 1 subarray with. Define a pair u,v which consists of one element from the first array and one element from the second array. Two sum iii data structure design two sum iv input is a bst 4 sum. Find the kth smallest sum out of all possible sums. Combination sum iii find all possible combinations of k numbers that add up to a number n, given that only numbers from 1 to 9 can be used and each combination should be a.
Contribute to shiminlei leetcode development by creating an account on github. I use ep to practice, and cci for a quick interview prep. Key is the sum and value is the number of the times sum appeared. Given n distinct positive integers, integer k k books 437 question. It is from these brute force solutions that you can come up with optimizations. Not really, because that would require potentially n operations on each loop, making this on4 instead of on3. Introduction strings strstr reverse words in a string rotate string binary search. If this value is removed from currsum then desired sum can be obtained.
I need to find its minimum sum after these k manipulations. The solution set must not contain duplicate triplets. You must distribute the continuous id books to one people to copy. Letter combinations of a phone number leetcode 401. Find all unique triplets in the array which gives the sum of zero. Again, its best to try out brute force solutions for just for completeness. Given an array of n integers nums and a target, find the number of index triplets i, j, k with 0 k k apr 19, 2020 find the total number of contiguous subarrays whose sum is equal to k. Path sum ii given a binary tree and a sum, find all roottoleaf paths where each paths sum equals the given sum. Rotate an array of n elements to the right by k steps. Leetcode subarray sum equals k 30days challenge, week 4, given an array of integers and an integer k, you need to find the total number of continuous subarrays whose sum equals to k. Given two integer arrays sorted in ascending order and an integer k. For many problems where data is stored in an 1darray. Subarray sum equals k intersection of two arrays intersection of two arrays ii. Introduction 001 two sum 002 add two numbers 003 longest substring without repeating characters.
Now iterate over the cost array and keep calculating the sum of costs until the sum is less than or equal to k. Finally return the number of toys used to calculate. A really brute force way would be to search for all possible pairs of numbers but that would be too slow. Given an array s of n integers, find three integers in s such that the sum is closest to a given number, target.
Notice elements in a triplet a,b,c must be in nondescending order. A valid path is from root node to any of the leaf nodes. Maximise the number of toys that can be purchased with amount k. Contribute to erica8 leetcode development by creating an account on github. Given an array of integers nums and a positive integer k, find whether its possible to divide this array into k nonempty subsets whose sums are all equal. Hashset avoids this by hashing the input and is o1. The range of numbers in the array is, and the range of the integer k is 1e7, 1e7. Notice you can only move either down or right at any point in time. This is the best place to expand your knowledge and get prepared. You are given two integer arrays nums1 and nums2 sorted in ascending order and an integer k. You are given a list of nonnegative integers, a1, a2. Given an array of integers and an integer k, you need to find the total number of continuous subarrays whose sum equals to k. Given an array of integers and an integer k, you need to find the total number of continuous subarrays whose sum equals to k example 1. Introduction merge k sorted lists 1 two sum 2 add two numbers 3 longest substring without repeating characters.
Subarray sum equals k intersection of two arrays intersection of two arrays ii find pivot index rotate array get smallest nonnegative integer not in the array. After buckling down and studying the questions contained on. Introduction strings strstr reverse words in a string. Merge k sorted lists copy list with random pointer convert sorted list to balanced bst.