Source of the topic:https://leetcode.com/problems/3sum-closest/
Test Instructions Analysis:This topic input an array of nums and a number of target, find the array of three numbers, make them and closest to target, return these three numbers of the and.
Topic Ideas:This topic is similar to the previous 3Sum, so it is possible to solve this problem in a comparable way. The whole process is divided into two steps:① array sorting; This step t
because of their operation in the array is weak, and then through the expert guidance, need to study this book, originally wanted this title is more advanced, this bad play. But looking at the things that suddenly feel like talking is more basic. But a lot of things, usually still did not notice, so write reading notes and gentlemen mutual encouragement! The second one2.2.1 Creating an arrayHow to create an array? That's more efficient? What is the reason?The first mode ofvar
Python sequence and Python SequencePython contains six built-in sequences: List, tuples, strings, Unicode, buffer objects, and xrange objects.
Common sequence operations include indexing, sharding, adding, multiplication, and membership.
There are also built-in functions such as length (len), minimum value (min), and maximum value (mix ).
List
Basic list operations
# Create a list> nums = [1, 2, 3, 5]> nums
) return 2.0LOG10 (x) returns the logarithm of x with a base of 10, such as MATH.LOG10 (100), returning 2.0Max (x1, x2,...) Returns the maximum value of the given parameter, which can be a sequence.Min (x1, x2,...) Returns the minimum value of the given parameter, which can be a sequence.MODF (x) returns the integer part of x and the decimal part, and the numeric symbol in two parts is the same as x, and the integral part is represented by a floating-point type.Pow (x, y) x**y the value after th
Follow to "Search in rotated Sorted Array":What if duplicates is allowed?Would this affect the run-time complexity? How and why?Write a function to determine if a given the target was in the array.This topic is in https://leetcode.com/problems/search-in-rotated-sorted-array/On the basis of the addition of the Allow to have the same element for this condition.Then there will be a special case, such as 1,1,1,1,1,3,3 after rotation for 1,3,3,1,1,1,1.When the middle element equals the first element,
than its number recorded, as may need to exchange the number (the reason is probably because of special circumstances, such as [1,5,6,2], this time than 2 small is 1, but notice that 5 is also smaller than 6, Exchange 5,6 get 1652, Exchange to get 2561, obviously 1652 is compliant instead of 2561) put the number that may need to be exchanged (index to do front and end, such as 1 index for front and 2 index to end) after recording down from the start index minus repeatedly back to look for, Loop
Missingnumber problem Description: Given an array, the array number range is 0-n and the missing number is found. such as NUMS={0,1,3},RETURN2.Algorithm Analysis: The first method, sorting the array, and then find and subscript inconsistent numbers, subscript is the missing number. The second method, for such an array, if there is no missing number, even if there is no sort, the subscript-number difference is added to 0. Assuming that the missing numb
1 Topic AnalysisThis is the upper version of the above, that is, searching for a loop array with repeating characters2. Solving IdeasLet's look at the topic of version1, a circular array search without repeating characters.Idea 1.Violent for Loop ACIdea 2.Now that the rotate has been found, find the mutation position, translate all the subscripts, and then find the two points.Idea 3.In fact, we can not translate, we see the picture is clear (this question ascending is the hidden condition, the r
97 65}
Sort the first and second parts respectively. {27 38 13} after switching between step 3 and Step 4, the parts are sorted by {13 27 38.
{76 97 65} after switching between step 3 and Step 4, it is changed to {65 76 97.Code
Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->Using System;Using System. Text;Namespace QuickSortArithmetic{Class Program{Static void Main (string [] args){// Generate an int32 array of 70 three-digit numbers as need
Learning reference: Heap Sorting heap sort, sort six-heap sortHeap structure: A completely binary tree. Dagen:k[i] This paper test data: "Yan Granny data Structure" P281Because I am busy with my studies, I did not write code to visualize the tree structure. Readers, please fill your heart with brain.
Heap adjustment functions:
1 protected voidHeapadjust (int[] Nums,intAintb) {2 inti;3 for(i=a;ab;) {4
algorithm by using the queue to represent the box. We need 9 queues, each corresponding to a number. All queues are stored in an array, using the rest and division operations to determine the single-digit and 10 digits. The remainder of the algorithm adds numbers to the queue, sorts them according to Single-digit values, and sorts them according to the numbers on the ten. The result is a sorted numberThe following is a function that assigns numbers to the corresponding queue based on the numeri
/***********************************************************************Search in rotated Sorted ArraySuppose an array sorted in ascending order are rotated at some pivot unknown to you beforehand.(i.e., 0 1 2 4 5 6 7 might become 4 5 6 7 0 1 2).You is given a target value to search. If found in the array is return its index, otherwise return-1.Assume no duplicate exists in the array.eg0 1 2 3 4//Right order situation4 0 1 2 3//Right order situation3 4 0 1 2//Right order situation2 3 4 0 1//left
interval binary, until equal, return the value of this positionJava code Implementation :Because the second median definition needs to be positioned at two locations, the first extension is possible, so first one is discussed:1 Public Static intGetmedian (int[] nums) {2 returnPartition (nums, 0, Nums.length-1);3 }4 5 Private Static intPartition (int[]
The algorithm of three version below is essentially the same, namely, Kadane ' s algorithm, which are of O (n) complexity. Https://en.wikipedia.org/wiki/Maximum_subarray_problemThe evolution of the implementations is to remove redundancy and does what are really needed, the side effect of doing so are becoming more efficient.IMHO, version 1.0.2 is well commented which shows the guidelines of efficient bookkeeping of boundaries, first and last CA n also is easily changed to First_iter and last_it
Source of the topic:https://leetcode.com/problems/3sum/
Test Instructions Analysis:This topic is input an array of nums. Find out all 3 numbers so that the sum of the 3 numbers is 0.1. The 3 digits of the output are sorted by small to large, and the combination of 2.3 numbers is not repeated. For example, enter [ -1,0,1,2,-1,-4], which should return [[ -1,0,1],[-1,-1,2]].
Topic Ideas:If the direct violence is resolved, then the time comple
This problem are more or less the same as Find Minimum in rotated Sorted Array. And one key difference is as stated in the solution tag. That's, due to duplicates, we are not being able to throw one half sometimes. And in this case, we could just apply linear search and the time complexity would become O(n) .The idea to solve this problem was still to use invariants. We set to is the left pointer and to is the right l r pointer. Since duplicates exist, the invatiant is
Leetcode Remove ElementProblem descriptionGiven an array and a value, remove all instances of that value in place and return the new length.Do the allocate extra space for another array, and you must does this on place with constant memory. The order of elements can be changed. It doesn ' t matter what are you leave beyond the new length.For example, given input array nums = [3,2,2,3] , val = 3. Your function should return length = 2, with the first o
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