Remove K Digits | Greedy + Monotonic Stack Explained | GFG POTD 19 Jan 2026

GFG POTD (19th Jan 2026)

Educational Insight

The "Remove K Digits" problem is a classic example of the Greedy Strategy optimized by a Monotonic Stack.

When minimizing a number’s value, the priority is always the highest-order magnitude (the leftmost digits). By maintaining a non-decreasing sequence, we ensure the smallest possible leading digits.

Key Implementation Details
• Use a `StringBuilder` or `Stack` for O(1) removals from the end
• Handle the edge case where K remains after the main loop
• Strip leading zeros to maintain a valid numerical representation

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Видео Remove K Digits | Greedy + Monotonic Stack Explained | GFG POTD 19 Jan 2026 канала Visually Inclined