CA 19 - First & Last Occurences

 

First and Last Occurrences

Difficulty: MediumAccuracy: 37.36%Submissions: 314K+Points: 4Average Time: 15m

Given a sorted array arr with possibly some duplicates, the task is to find the first and last occurrences of an element x in the given array.
Note: If the number x is not found in the array then return both the indices as -1.

Examples:

Input: arr[] = [1, 3, 5, 5, 5, 5, 67, 123, 125], x = 5
Output: [2, 5]
Explanation: First occurrence of 5 is at index 2 and last occurrence of 5 is at index 5

Input: arr[] = [1, 3, 5, 5, 5, 5, 7, 123, 125], x = 7
Output: [6, 6]
Explanation: First and last occurrence of 7 is at index 6
Input: arr[] = [1, 2, 3], x = 4
Output: [-1, -1]
Explanation: No occurrence of 4 in the array, so, output is [-1, -1]

Constraints:
1 ≤ arr.size() ≤ 106
1 ≤ arr[i], x ≤ 109




MY CODE:


class Solution:

    def find(self, arr, x):

        arr.sort()

        a=-1

        b=-1

        for i in range(len(arr)):

            if arr[i] == x:

                if a==-1:

                    a=i

                b=i

        return[a,b]

        



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