ZaicevSergey / stage0-module5-task1

Algorithm and Arrays

Algorithm and Arrays

Task 1. Fridge Algorithm

This is a first task in this module. You need to get milk from a fridge.

Call the methods of the Fridge object inside the fridgeAlgorithm method in the required logical order.

P.S All methods of interaction with the fridge can be found inside the Fridge interface.

Task 2. Algorithm Complexity

Tasks for assessing the algorithm complexity. The following are the ratios of the constants with the BigO estimate:

Complexity.O_LOG_N       -> O(log N)
Complexity.O_N_2         -> O(log N^2)
Complexity.O_FACTORIAL_N -> O(!N)
Complexity.O_2_N         -> O(2 * N)
Complexity.O_N_LOG_N     -> O(N * log N)
Complexity.O_1           -> O(1)
Complexity.O_N           -> O(N)

Subtasks:

• badLinerSearch - return the linear search complexity if the element you are looking for is at the end of the array.
• arrayIndexItemAccess - return the complexity of accessing an array element by index.
• binarySorting - return the complexity of a binary search.
• twoCycleSorting - return the complexity of the Two Cycle Sorting algorithm.

Task 3. Arrays Tasks

Here are the tasks for working with the arrays. The usage of any additional packages (such as java.util.*) is forbidden.

Subtasks:

• seasonsArray - return a String[] array that will list all the seasons of the year, starting with winter.
• generateNumbers - generate an int[] array of consecutive positive integers starting at 1 of the given length ( length parameter > 0)

Example:
length = 1  -> [1]
length = 3  -> [1, 2, 3]
length = 5  -> [1, 2, 3, 4, 5]

• totalSum - find the sum of all elements of the int[] array.

Example:
arr = [1, 3, 5]   -> sum = 9
arr = [5, -3, -4] -> sum = -2

• findIndexOfNumber - return the index of the first occurrence of number in the arr array. If there is no such element in the array, return -1.

Example:
arr = [99, -7, 102], number = -7    ->   2
arr = [5, -3, -4],   number = 10    ->  -1

• reverseArray - return the new String[] array obtained from the arr array by reversing the order of the elements.

Example:
arr = ["Bob", "Nick"]               -> ["Nick", "Bob"]
arr = ["pineapple", "apple", "pen"] -> ["pen", "apple", "pineapple"]

• getOnlyPositiveNumbers - return new int[] array obtained from arr int[] array by choosing positive numbers only. P.S. 0 is not a positive number

Example:
arr = [1,-2, 3]      -> [1, 3]
arr = [-1, -2, -3]   -> []
arr = [1, 2]         -> [1, 2]

• [OPTIONAL] sortRaggedArray - return a sorted, ragged, two-dimensional int[][] array following these rules:
  • incoming one-dimensional arrays must be arranged in ascending order of their length;
  • numbers in all one-dimensional arrays must be in ascending order.

Example:
arr = [[3, 1, 2,], [3,2]] -> [[2, 3], [1, 2, 3]]
arr = [[5, 4], [7]]       -> [[7], [4, 5]]