2022-07-09 update: added "Lemonade Change" (#28)

Author: fartem

src/main/java/com/smlnskgmail/jaman/leetcodejava/easy/LemonadeChange.java

@@ -0,0 +1,38 @@
+package com.smlnskgmail.jaman.leetcodejava.easy;
+
+// https://leetcode.com/problems/lemonade-change/
+public class LemonadeChange {
+
+    private final int[] input;
+
+    public LemonadeChange(int[] input) {
+        this.input = input;
+    }
+
+    public boolean solution() {
+        int five = 0;
+        int ten = 0;
+        for (int bill : input) {
+            if (bill == 5) {
+                five++;
+            } else if (bill == 10) {
+                if (five == 0) {
+                    return false;
+                }
+                five--;
+                ten++;
+            } else {
+                if (five > 0 && ten > 0) {
+                    five--;
+                    ten--;
+                } else if (five >= 3) {
+                    five -= 3;
+                } else {
+                    return false;
+                }
+            }
+        }
+        return true;
+    }
+
+}

src/test/java/com/smlnskgmail/jaman/leetcodejava/easy/LemonadeChangeTest.java

@@ -0,0 +1,14 @@
+package com.smlnskgmail.jaman.leetcodejava.easy;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertTrue;
+
+public class LemonadeChangeTest {
+
+    @Test
+    public void defaultTest() {
+        assertTrue(new LemonadeChange(new int[]{5, 5, 5, 10, 20}).solution());
+    }
+
+}