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CoinChange.java

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/**

*

* @author Varun Upadhyay (https://github.com/varunu28)

*

*/

public class CoinChange {

// Driver Program

public static void main(String[] args) {

int amount = 12;

int[] coins = {1, 2, 5};

System.out.println("Number of combinations of getting change for " + amount + " is: " + change(coins, amount));

}

/**

* This method finds the number of combinations of getting change for a given amount and change coins

*

* @param coins The list of coins

* @param amount The amount for which we need to find the change

* Finds the number of combinations of change

**/

public static int change(int[] coins, int amount) {

int[] combinations = new int[amount+1];

combinations[0] = 1;

for (int coin : coins) {

for (int i=coin; i<amount+1; i++) {

if (i>=coin) {

combinations[i] += combinations[i-coin];

}

}

// Uncomment the below line to see the state of combinations for each coin

// printAmount(combinations);

}

return combinations[amount];

}

// A basic print method which prints all the contents of the array

public static void printAmount(int[] arr) {

for (int i=0; i<arr.length; i++) {

System.out.print(arr[i] + " ");

}

System.out.println();

}

}