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- Steve Jobs

Remove Duplicate Element From an Array

C Finding Duplicate Element in an Array

Here your task to collect any number of elements in an array and you have to display an array with non duplicate elements.

C Program - Remove Duplicate Elements From an Array

Let us write our own c program to Remove Duplicate Elements From An Array

remove-duplicate-element-from-array.c
#include <stdio.h>
int main()
{
int i, j, k, flag = 0, a[10], n;
printf("Enter array size: ");
scanf("%d",&n);
for(i = 0;i < n;i++)
scanf("%d ",&a[i]);
printf("\n");
for(i = 0;i < n;i++)
{
for(j = i-1;j >= 0;j--)
{
if(a[i] == a[j])
{
flag = 1;
}
}
if(flag == 0)
{
printf("%d\t",a[i]);
}
flag = 0;
}
return 0;
}
Enter array size : 6
1 1 2 3 4 5
1 2 3 4 5

Note:

The above program looks very simple, here goes the logic

  • First element will never be a duplicate element.
  • Compare second element with first element for duplicate check, if it is not a duplicate element then print else skip.
  • Compare third element with first and second element for duplicate check, if it is not a duplicate element then print else skip.
  • Repeat the step until you reach the last element in an array.

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