C Exercises: Find the minimum length of subarray such that, sorting this subarray makes the whole array sorted

C Array: Exercise-91 with Solution

An unsorted array of a specific size is given. Write a program in C to find the minimum length of a subarray such that sorting this subarray makes the whole array sorted.

Sample Solution:

C Code:

#include<stdio.h> 
   
void findUnsortedSubArr (int arr1[], int arr_size) 
{ 
  int m = 0, en = arr_size-1, i, max, min;    
   
  for (m = 0; m < arr_size-1; m++) 
  { 
    if (arr1[m] > arr1[m+1]) 
      break; 
  } 
  if (m == arr_size-1) 
  { 
    printf("The given array is sorted."); 
    return; 
  } 
   
  for(en = arr_size - 1; en > 0; en--) 
  { 
    if(arr1[en] < arr1[en-1]) 
      break; 
  } 
   
  max = arr1[m]; min = arr1[m]; 
  for(i = m + 1; i <= en; i++) 
  { 
    if(arr1[i] > max) 
      max = arr1[i]; 
    if(arr1[i] < min) 
      min = arr1[i]; 
  } 
   
  for( i = 0; i < m; i++) 
  { 
    if(arr1[i] > min) 
    {   
      m = i; 
      break; 
    }       
  }  
   
  for( i = arr_size -1; i >= en+1; i--) 
  { 
    if(arr1[i] < max) 
    { 
      en = i; 
      break; 
    }  
  }   
  printf("The minimum length of unsorted subarray which makes the given array sorted ");
   printf("\nlies between the indeces %d and %d", m, en); 
  return; 
} 
   
int main() 
{ 
  int arr1[] = {10, 12, 15, 17, 28, 32, 42, 18, 56, 59, 67}; 
  int arr_size = sizeof(arr1)/sizeof(arr1[0]); 
  int i;
   //------------- print original array ------------------	
	printf("The given array is:  \n");
	for(i = 0; i < arr_size; i++)
		{
			printf("%d  ", arr1[i]);
		}
	printf("\n");
//-----------------------------------------------------------  
  findUnsortedSubArr(arr1, arr_size); 
  return 0; 
} 

Sample Output:

The given array is:  
10  12  15  17  28  32  42  18  56  59  67  
The minimum length of unsorted subarray which makes the given array sorted 
lies between the indeces 4 and 7

Pictorial Presentation:

Flowchart:

C Programming Code Editor:

Improve this sample solution and post your code through Disqus.

Previous: Given an array of size n such that every element is in the range from 0 to n-1. Write a program in C to rearrange the given array so that arr[i] becomes arr[arr[i]].
Next: Write a program in C that checks whether the elements in an unsorted array appears consecutively or not.