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C Exercises: Find the next greater elements in a given unsorted array

C Array: Exercise-43 with Solution

Write a program in C to to print next greater elements in a given unsorted array. Elements for which no greater element exist, consider next greater element as -1.

Pictorial Presentation:

C Exercises: Find the next greater elements in a given unsorted array

Sample Solution:

C Code:

#include <stdio.h>

void findNxtLrgElem (int *arr1, int arr1_size) 
{
    int nxtBgElem, i, j;
    for(i = 0; i < arr1_size; i++) 
	{
        for (j = i+1, nxtBgElem = -1; j < arr1_size; j++) 
		{
            if (arr1[i] < arr1[j]) 
			{
                nxtBgElem = arr1[j];
                break;
            }
        }
        printf("Next bigger element of %d in the array is:   %d\n", arr1[i], nxtBgElem);
    }
}
void formBigElemArray (int *arr1, int arr1_size) 
{
    int nxtBgElem, i, j;
    for(i = 0; i < arr1_size; i++) 
	{
        for (j = i+1, nxtBgElem = -1; j < arr1_size; j++) 
		{
            if (arr1[i] < arr1[j]) 
			{
                nxtBgElem = arr1[j];
                break;
            }
        }
        printf("%d ", nxtBgElem);
    }
}
int main() 
{
    int i, arr1[]= {5, 3, 10, 9, 6, 13};
    int ctr = sizeof(arr1) / sizeof(arr1[0]);	
//------------- print original array ------------------	
	printf("The given array is :  ");
	for(i = 0; i < ctr; i++)
	{
	printf("%d  ", arr1[i]);
    } 
    printf("\n");	
//-----------------------------------------------------
    printf("\nNext Bigger Elements are:\n");
    findNxtLrgElem(arr1, ctr);
	
    printf("\nNext Bigger Elements Array:\n");
    formBigElemArray(arr1, ctr);	
    return 0;
}

Sample Output:

The given array is :  5  3  10  9  6  13  

Next Bigger Elements are:
Next bigger element of 5 in the array is:   10
Next bigger element of 3 in the array is:   10
Next bigger element of 10 in the array is:   13
Next bigger element of 9 in the array is:   13
Next bigger element of 6 in the array is:   13
Next bigger element of 13 in the array is:   -1

Next Bigger Elements Array:
10 10 13 13 13 -1 

Flowchart:

Flowchart: Find the next greater elements in a given unsorted array

C Programming Code Editor:

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