# C Programming – HackerRank Solution | Find ODD 1 |

### (HackerRank) Write a Modular C Programming code to solve Find ODD 1, All elements in an array occurs even number of times, except one element. Find the element which occurs odd number of times.

All elements in an array occur an even number of times, except one element. Find the element which occurs odd number of times.

Input Format

First-line contains ‘N’, number of array elements followed by ‘N’ elements separated by a space in the next line

Constraints

N>0 and N<=10^4

-10^5<=a[i]<=10^5

Output Format

Output the element occurring odd number of times.

Sample Input 0

```-1
```

Sample Output 0

```Invalid
```

Sample Input 1

```9
1 2 3 1 3 4 2 2 4
```

Sample Output 1

```2
```

Explanation 1

``We clearly see that all elements occurs even number of times except 2``

CODE:

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

int main() {
int n;
scanf("%d",&n);
if(n>0)
{
int array[n],i,j,count;
for(i=0;i<n;i++)
{
scanf("%d",&array[i]);
}
for(i=0;i<n;i++)
{
count=0;
for(j=0;j<n;j++)
{
if(array[i]==array[j])
count++;
}
if(count%2!=0)
{
printf("%d",array[i]);
break;
}
}
}
else{
printf("Invalid");
}
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)

-1

Invalid
Expected Output

Invalid```

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