Solving Product of Array Except Self using Prefix/suffix.

Problem

Product without division.

Pattern

This problem demonstrates the Prefix/suffix pattern.

Approach

Two passes for prefix and suffix products.

Solution 

  // Solution for Product of Array Except Self
// Pattern: Prefix/suffix
// O(n) time, O(1) extra space

Complexity

O(n) time, O(1) extra space

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