solves #2806: account balance after rounded purchases

Author: anishLearnsToCode

README.txt

@@ -842,5 +842,5 @@
 | 2784 | [Check if Array is Good](https://leetcode.com/problems/check-if-array-is-good)                                                                                         |                                                                                   [![Java](assets/java.png)](src/CheckIfArrayIsGood.java)                                                                                                                                               |                                                                                                                                   |
 | 2788 | [Split Strings by Separator](https://leetcode.com/problems/split-strings-by-separator)                                                                                 |                                                                                   [![Java](assets/java.png)](src/SplitStringsBySeparator.java)                                                                                                                                               |                                                                                                                                   |
 | 2798 | [Number of Employees Who Met the Target](https://leetcode.com/problems/number-of-employees-who-met-the-target)                                                         |                                                                                   [![Java](assets/java.png)](src/NumberOfEmployeesWhoMetTheTarget.java)                                                                                                                                               |                                                                                                                                   |
-| 2806 | [Account Balance After Rounded Purchase](https://leetcode.com/problems/account-balance-after-rounded-purchase)                                                         |                                                                                                                                                                                                                                  |                                                                                                                                   |
+| 2806 | [Account Balance After Rounded Purchase](https://leetcode.com/problems/account-balance-after-rounded-purchase)                                                         |                                                                                   [![Java](assets/java.png)](src/AccountBalanceAfterRoundedPurchase.java)                                                                                                                                               |                                                                                                                                   |
 | 2810 | [Faulty Keyboard](https://leetcode.com/problems/faulty-keyboard)                                                                                                       |                                                                                                                                                                                                                                  |                                                                                                                                   |

src/AccountBalanceAfterRoundedPurchase.java

@@ -0,0 +1,10 @@
+// https://leetcode.com/problems/account-balance-after-rounded-purchase
+// T: O(1)
+// S: O(1)
+
+public class AccountBalanceAfterRoundedPurchase {
+    public int accountBalanceAfterPurchase(int purchaseAmount) {
+        final int purchaseAmountRounded = (int) (Math.round(purchaseAmount / 10.0) * 10);
+        return 100 - purchaseAmountRounded;
+    }
+}

src/HelloWorld.java

@@ -26,12 +26,7 @@ public int query(int a, int b) {
     }
 
     public static void main(String[] args) {
-        HelloWorld helloWorld = new HelloWorld(new int[] {1, 2, 3, 4, 5, 1, 2, 1, 2}, 5);
-        System.out.println(helloWorld.query(0, 0));
-        System.out.println(helloWorld.query(0, 1));
-        System.out.println(helloWorld.query(0, 2));
-        System.out.println(helloWorld.query(3, 3));
-        System.out.println(helloWorld.query(20, 30));
-        System.out.println(helloWorld.query(10, 15));
+
+        System.out.println(Math.round(10.5));
     }
 }