# Write a c code section for merge sort algorithm array

This algorithm works as follows. The quick-sort algorithm is usually much faster, especially for large arrays. Expert programmers know why one algorithm is faster than others, as well as how to quantify that difference. In this case, the better algorithm is a hundred times faster! If your database had to sort a million elements, the contrast would be far greater still.

See why it pays to understand algorithms? The Selection Sort Suppose you were stranded on a desert island and wanted to sort a row of coconuts. Scan all the coconuts and put the smallest one in the first leftmost position.

Among the remaining N-1 coconuts, put the smallest in the second position. Among the remaining N-2 coconuts, put the smallest in the third position.

## C program to sort array in ascending or descending order - Codeforwin

Continue until the entire row has been sorted. There is probably no better way to sort an array manually, because a more complex procedure might confuse a human worker. The computer has to follow this procedure: Assume that the leftmost element is the smallest. Compare the element from step 1 to the next element in the array.

If the next element is smaller than the current minimum that is, the element at position iMinchange the value of iMin to index this new position.

Repeat this process until you reach the end of the array. Bear in mind that this is the procedure for finding the smallest element during one pass of the algorithm.

For an array of size N, the total number of comparisons is determined as follows: To find the smallest element, make N-1 comparisons.

To find the second-smallest element, make N-2 comparisons. To find the third-smallest element, make N-3 comparisons. So, for an array of size 6, the total number of comparisons required for sorting is as follows: A selection sort always requires O n2 operations.

Even if the array is already sorted, the algorithm has to make the same number of comparisons. Relatively speaking, O n2 is expensive. What happens if we need to sort a million elements?

The code takes each position in turn, starting with the first, and finds the lowest element in the range consisting of that position and everything to its right.Rating of 5 (85 votes) | Used: times | Last Successful Use: 4 hours ago. I tried this code in codeblocks and ideone but it seems that time taken for sorting 35 elements is seconds and beyond that the code shows terminated due to .

Source code of simple merge sort implementation using array in ascending order in c programming language. #include #define MAX void mergeSort Write a c program for merge sort.

7. Write a c program for shell sort. 8. Big list of c . A sorting algorithm is an algorithm made up of a series of instructions that takes an array as input, performs specified operations on the array, sometimes called a list, and outputs a sorted array.

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before reading on. For packages which contain code to be compiled, a computing environment including a number of tools is assumed; the “R Installation and Administration” manual describes what is needed for each OS.

The merge sort is a recursive sort of order n*log(n). It is notable for having a worst case and average complexity of O(n*log(n)), and a best case complexity of O(n) (for pre-sorted input). The basic idea is to split the collection into smaller groups by halving it until the groups only have one element or no elements (which are both entirely sorted groups).

MergeSort algorithm in c# - Stack Overflow