selection-sort

问题 i want to implement a selection sort method that takes an array of ints and sorts it in a descending order. however, the trick is to keep the original selection sort method unchanged but instead using simple arithmetic operations and without adding extra loops to swap the elements after the array finished sorting. this is my code and the idea is to store the position of the maximum value and the minimum value in local variables and swap them with the corresponding position after the inner

问题 Working on this challenge on HackerRank and got this code to pass 10 out of 15 test cases. It is failing due to timeout error which is HackerRank's way of telling you that the algorithm is not optimized. How can I optimize this code to run on larger input data? The goal is to figure out the minimum number of swaps necessary to sort an unsorted array. Update : Each element in the array is distinct. def minimum_swaps(arr): """Returns the minimum number of swaps to re-oder array in ascending

问题 Why is the best case time complexity for selection sort O(n^2) when it is O(n) for insertion sort and bubble sort? Their average times are same. I don't understand why the best case times are different. Would appreciate some help. 回答1: For selection sort you have to search the minimum and put it on the first place in the first iteration. In the second iteration you have to search the minimum in the non-sorted part of the array and put it to the second place and so on... You only know which

问题 If anyone can give some input on my logic, I would very much appreciate it. Which method runs faster for an array with all keys identical, selection sort or insertion sort? I think that this would be similar to when the array is already sorted, so that insertion sort will be linear, and the selection sort quadratic. Which method runs faster for an array in reverse order, selection sort or insertion sort? I think that they would run similarly, since the values at every position will have to be

问题 If anyone can give some input on my logic, I would very much appreciate it. Which method runs faster for an array with all keys identical, selection sort or insertion sort? I think that this would be similar to when the array is already sorted, so that insertion sort will be linear, and the selection sort quadratic. Which method runs faster for an array in reverse order, selection sort or insertion sort? I think that they would run similarly, since the values at every position will have to be

问题 So I've got a .txt file as follows: 131,263.07 47,170.14 170,190.01 180,412.69 53,401.53 And I had to read the file so as to output the list like: 131 kms, $263.07 47 kms, $170.14 170 kms, $190.01 180 kms, $412.69 53 kms, $401.53 The code I used was: def PrintList(table): for line in table: print(str(line[0]) + " kms, $" + str(line[1])) file = open(input("Enter file name: ")) table = [] for line in file: line = line.rstrip().split(",") line[0] = int(line[0]) line[1] = float(line[1]) table

问题 I have implemented two algorithms for sorting elements from highest to lowest. The first one, takes quadratic time on the real RAM model and the second an O(n log(n)) time. The second one uses priority queues to get the reduction. Here are the timings, which are the output of the above program. the first column is the size of the random array of integers the second column is the time in seconds for the O(n^2) technique the third column is the time in seconds for the O(n log(n)) technique 9600

问题 I have to implement a Selection Sort in Java according to these parameters: Implement a variation to the SelectionSort that locates both the smallest and largest elements while scanning the list and positions them at the beginning and the end of the list, respectively. On pass number one, elements x0,...,xn-1 are scanned; on pass number two, elements x1,...,xn-2 are scanned; and so on. I am passing the method an array of size 32, and when I print the array it is not sorted. What's the matter

问题 I'm having an issue with a homework problem involving the Selection Sort concept. We were given a skeleton code within which we need to complete the bool compare(...) and void selectionsort(...) functions, which I have done. Then, running the program should sort the strings given in main() alphabetically, and prints them in alphabetical order after printing the initial strings. However, mine doesn't sort it alphabetically and after trying to change multiple things I am stuck on figuring out

问题 What is the significance of selection sort? It has a time complexity of O(n^2) even in best case scenario. So why is it still prevalent? 回答1: It is simple to write and intuitive for people to understand It is the closest to the way real humans approach sorting lists. It functions in-place in memory After n iterations you know the first n elements are sorted. After the first iteration the first item is sorted, after the second is finished the first 2 are sorted, etc... 来源： https:/