156. Coin Change II

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Input: amount = 5, coins = [1, 2, 5]

Output: 4

Explanation: There are four ways to make up the amount: 5=5, 5=2+2+1, 5=2+1+1+1, 5=1+1+1+1+1

Input: amount = 3, coins = [2]

Output: 0

Explanation: The amount of 3 cannot be made up just with coins of 2.

Input: amount = 10, coins = [10]

Output: 1

Explanation: There is one way to make up the amount: 10=10

Time Complexity

O(A × N)

Space Complexity

O(A × N)