Which of the following problems CANNOT be solved using the Coin Change II (Count Ways) dynamic programming pattern?

easy🔍 Pattern Recognition Q2 of Q15

Dynamic Programming: Knapsack - Coin Change II (Count Ways)

ACount permutations of coins to make amount with unlimited coins

BCount the number of ways to make amount with unlimited coins, order does not matter

CCount combinations to make amount with unlimited coins

DCount ways to make amount with unlimited coins, order does not matter

Step-by-Step Solution

Solution:

Step 1: Understand Coin Change II pattern
This pattern counts combinations where order does not matter and coins are unlimited.
Step 2: Identify anti-pattern
Counting permutations (order matters) is NOT solved by Coin Change II pattern.
Final Answer:
Option A -> Option A
Quick Check:
Order matters -> permutations -> different pattern [OK]

Quick Trick: Order matters? Not Coin Change II pattern [OK]

Common Mistakes:

MISTAKES

Trap Explanation:

PITFALL

Many candidates think Coin Change II counts permutations, but it counts combinations only.

Interviewer Note:

CONTEXT

Checks if candidate can distinguish between combination and permutation DP patterns.

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