Solving Find First and Last Position using Binary Search.

Problem

Solve Find First and Last Position.

Pattern

This problem demonstrates the Binary Search pattern.

Approach

Binary search on answer or array.

Solution 

  // solution

Complexity

O(log n)

Best Practices

  • Identify the pattern before coding — pattern recognition saves time
  • Handle edge cases: empty input, single element, duplicates
  • Use descriptive variable names even in timed interviews
  • Test with the provided examples plus one custom case