add 2043

Author: fishercoder1534

README.md

@@ -8,6 +8,7 @@ _If you like this project, please leave me a star._ ★
 
 |  #  |      Title     |   Solutions   | Video  | Difficulty  | Tag                  
 |-----|----------------|---------------|--------|-------------|-------------
+|2043|[Simple Bank System](https://leetcode.com/problems/simple-bank-system/)|[Java](../master/src/main/java/com/fishercoder/solutions/_2043.java) ||Medium||
 |2042|[Check if Numbers Are Ascending in a Sentence](https://leetcode.com/problems/check-if-numbers-are-ascending-in-a-sentence/)|[Java](../master/src/main/java/com/fishercoder/solutions/_2042.java) ||Easy||
 |2039|[The Time When the Network Becomes Idle](https://leetcode.com/problems/the-time-when-the-network-becomes-idle/)|[Java](../master/src/main/java/com/fishercoder/solutions/_2039.java) ||Medium||
 |2038|[Remove Colored Pieces if Both Neighbors are the Same Color](https://leetcode.com/problems/remove-colored-pieces-if-both-neighbors-are-the-same-color/)|[Java](../master/src/main/java/com/fishercoder/solutions/_2038.java) ||Medium||

src/main/java/com/fishercoder/solutions/_2043.java

@@ -0,0 +1,59 @@
+package com.fishercoder.solutions;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class _2043 {
+    public static class Solution1 {
+        class Bank {
+
+            List<Long> list;
+
+            public Bank(long[] balance) {
+                list = new ArrayList<>();
+                for (long b : balance) {
+                    list.add(b);
+                }
+            }
+
+            public boolean transfer(int account1, int account2, long money) {
+                if (account1 - 1 >= list.size()) {
+                    return false;
+                } else if (list.get(account1 - 1) < money) {
+                    return false;
+                } else if (account2 - 1 >= list.size()) {
+                    return false;
+                } else {
+                    Long original = list.remove(account1 - 1);
+                    list.add(account1 - 1, original - money);
+                    Long remove = list.remove(account2 - 1);
+                    list.add(account2 - 1, remove + money);
+                    return true;
+                }
+            }
+
+            public boolean deposit(int account, long money) {
+                if (account - 1 >= list.size()) {
+                    return false;
+                } else {
+                    Long original = list.remove(account - 1);
+                    list.add(account - 1, original + money);
+                    return true;
+                }
+            }
+
+            public boolean withdraw(int account, long money) {
+                if (account - 1 >= list.size()) {
+                    return false;
+                } else if (list.get(account - 1) < money) {
+                    return false;
+                } else {
+                    Long original = list.remove(account - 1);
+                    list.add(account - 1, original - money);
+                    return true;
+                }
+            }
+        }
+
+    }
+}