Implement lemonadeChange function for bill handling

Author: jyoung2419

leetcode3/정진영/860. Lemonade Change

@@ -0,0 +1,30 @@
+/**
+ * @param {number[]} bills
+ * @return {boolean}
+ */
+var lemonadeChange = function(bills) {
+    let five = 0;
+    let ten = 0;
+
+    for (let i = 0; i<bills.length; i++){
+        if (bills[i] == 5){
+            five++;
+        } else if (bills[i] == 10){
+            if (five == 0){
+                return false;
+            }
+            ten++;
+            five--;
+        } else {
+            if (ten > 0 && five > 0){
+                ten--;
+                five--;
+            } else if (five >= 3){
+                five -=3;
+            } else {
+                return false;
+            }
+        }
+    }
+    return true;
+};