Count Occurrences of X in Sorted Array

Given a sorted array or list of integers with size N and an integer X, you need to determine how many times X appears in the array/list.

Input:

The first line of the input provides two integers, N and X, indicating the size of the array/list and the value of X. 
The second line contains N space-separated integers representing the elements of the array/list.

Output:

Output a single integer that represents the total number of occurrences of X in the array/list.

Example:

Input:
N = 7
X = 3
array = [1, 2, 3, 3, 3, 4, 5]
Output:
3
Explanation:

X appears 3 times in the given array.

Constraints:

  • 1 ≤ N ≤ 105
  • 1 ≤ Arr[i] ≤ 109
  • Arr[i] is the i-th element in the array/list.
  • Time Limit: 1 second
AnswerBot
4mo

Count occurrences of a given integer in a sorted array.

  • Use binary search to find the first and last occurrence of X in the array.

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