# C Programming – HackerRank Solution | Repeating Element |

### Write a Modular C Programming code to solve Repeating Element, Given an array of integers find the first repeating element

Given an array of integers find the first repeating element.

Input Format

First Line contains the ‘N’ number of array elements, followed by ‘N’ array elements

Constraints

N>0 and N<=10^4 0<=a[i]<=10^9

Output Format

Output the first repeating element

Sample Input 0

```7
10 5 3 4 3 5 6
```

Sample Output 0

```5
```

Explanation 0

``````Even though 3 is repeating first, 5 comes before 3.
``````

Sample Input 1

```-5
```

Sample Output 1

```Invalid
```

Sample Input 2

```5
1 2 3 4 5
```

Sample Output 2

`No repeating element`

CODE:

```#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<math.h>

{
int i;
for(i=0;i<n;i++)
{
scanf("%d",&a[i]);
}
}
void repaeting(int a[30],int n)
{
int i,j,copy=0,st=0;
for(i=0;i<n;i++)
{
copy=a[i];
for(j=i+1;j<n;j++)
{
if(copy==a[j])
{
printf("%d",copy);
exit(0);
}
else st=1;
}
}
if(st==1)
{
printf("No repeating element\n");
}
}

int main()
{ int a[30],n;
scanf("%d",&n);
if(n>0)
{
repaeting(a,n);
}
else
printf("Invalid\n");
return 0;
}
```

OUTPUT

```Congratulations, you passed the sample test case.

Click the Submit Code button to run your code against all the test cases.

Input (stdin)

7
10 5 3 4 3 5 6

5
Expected Output

5```

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