Example 1:
Input: coins = [1,5,10], amount = 12
Output: 3
Explanation:
Example 2:
Input: coins = [2], amount = 3
Output: -1
Explanation:
Example 3:
Input: coins = [1], amount = 0
Output: 0
Explanation:
You are given an integer array coins representing coins of different denominations (e.g. 1 dollar, 5 dollars, etc) and an integer amount representing a target amount of money.
Return the fewest number of coins that you need to make up the exact target amount. If it is impossible to make up the amount, return -1.
You may assume that you have an unlimited number of each coin.
12 = 10 + 1 + 1. Note that we do not have to use every kind coin available.
The amount of 3 cannot be made up with coins of 2.
Choosing 0 coins is a valid way to make up 0.
1 <= coins.length <= 101 <= coins[i] <= 2^31 - 10 <= amount <= 10000