Consecutive Elements

Given an array arr of N non-negative integers, determine whether the array consists of consecutive numbers. Return true if they do, and false otherwise.

Input:

The first line of input contains a single integer T, representing the number of test cases or queries. Each test case includes two lines: The first line contains an integer 'N', the length of the array. The second line contains 'N' space-separated integers representing the elements of the array.

Output:

For each test case, print “True” or “False” in separate lines to indicate whether the elements of the array are consecutive.

Example:

Input: T = 1 N = 3 arr = [4, 3, 5]

Output: True

Constraints:

1 ≤ T ≤ 10

1 ≤ N ≤ 10^5

0 ≤ arr[i]

Question

Consecutive Elements

Given an array arr of N non-negative integers, determine whether the array consists of consecutive numbers. Return true if they do, and false otherwise.

Input:

The first line of input contains a single integer T, representing the number of test cases or queries. Each test case includes two lines: The first line contains an integer 'N', the length of the array. The second line contains 'N' space-separated integers representing the elements of the array.

Output:

For each test case, print “True” or “False” in separate lines to indicate whether the elements of the array are consecutive.

Example:

Input: 
 T = 1 
 N = 3 
 arr = [4, 3, 5]

Output: 
 True

Constraints:

1 ≤ T ≤ 10
1 ≤ N ≤ 10^5
0 ≤ arr[i] < 10^9

Note:

No need to print the expected output, just implement the function logic.

Accepted Answer

Determine if an array of non-negative integers contains consecutive numbers.

Check for duplicates: Use a set to track unique elements, as duplicates would prevent the array from being consecutive.
Range check: The difference between the maximum and minimum values in the array should equal N-1, where N is the number of elements.
Example: For arr = [4, 3, 5], max = 5, min = 3, N = 3; 5 - 3 = 2, which equals 3 - 1, so return True.
Edge case: An array with a single element is always consecutive (e.g., arr = [0]).