Find out all element of array are same in C

unique.c

#include <stdio.h>

int main() {
    // Write C code here
    int i, n, m, unique = 0;
    int value;
    printf("Size of array: ");
    scanf("%d", &n);
    
    int arr[n];
    
    for(i=0; i<n; i++) {
        scanf("%d", &arr[i]);
    }
    
    for(i=0; i<n; i++) {
        printf("%d ", arr[i]);
    }
    
    int first = arr[0];
     for (i=1; i<n; i++) {
       if (arr[i] == first) {
            unique += 1;
       }
     }
     
     printf("\n%d", (n-1));
     
     if(unique == (n-1)) {
         printf("\nYES");
     } else {
         printf("\nNO");
     }

    return 0;
}