How should I practice First and Last Occurrence?

Start by reading the full statement, solve the visible examples, then compare the pattern against related Swiggy online assessment problems in FastPrep.

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Problem

First and Last Occurrence

FULLTIMEONSITE INTERVIEW

You are given a sorted integer array nums and an integer target.

Return an array [first, last], where first is the first index where target appears and last is the last index where target appears.

If target does not appear in nums, return [-1, -1].

Examples

01 · Example 1

nums = [5, 7, 7, 8, 8, 10]
target = 8
return = [3, 4]

The value 8 first appears at index 3 and last appears at index 4.

02 · Example 2

nums = [5, 7, 7, 8, 8, 10]
target = 6
return = [-1, -1]

The target 6 is not present in the array.

Constraints

nums is sorted in non-decreasing order.

drafts saved locally

public int[] findFirstAndLastOccurrence(int[] nums, int target) {
  // write your code here
}

nums[5, 7, 7, 8, 8, 10]

target8

expected[3, 4]