← Pointer Manipulation

Micro-Drill #3 — Initialize 2D array

Pointer Manipulation Target: 10s

Correct 2D init avoids the shared-row aliasing bug. Foundation for all grid DP.

grid = [[0]*cols for _ in range(rows)]

Type it from memory. Go.

Practice Problems

• 62. Unique Paths
• 64. Minimum Path Sum

Related Coding Drills

• Drill #58 — Heapify an array Easy
• Drill #133 — Product of Array Except Self Medium
• Drill #126 — Remove Duplicates from Sorted Array Easy