Create simple-bank-system.cpp

Author: kamyu104

C++/simple-bank-system.cpp

@@ -0,0 +1,38 @@
+// Time:  ctor:     O(1)
+//        transer:  O(1)
+//        deposit:  O(1)
+//        withdraw: O(1)
+// Space: O(1)
+
+class Bank {
+public:
+    Bank(vector<long long>& balance) : balance_(balance) {
+        
+    }
+    
+    bool transfer(int account1, int account2, long long money) {
+        if (1 <= account2 && account2 <= size(balance_) && withdraw(account1, money)) {
+            return deposit(account2, money);
+        }
+        return false;
+    }
+    
+    bool deposit(int account, long long money) {
+        if (1 <= account && account <= size(balance_)) {
+            balance_[account - 1] += money;
+            return true;
+        }
+        return false;
+    }
+    
+    bool withdraw(int account, long long money) {
+        if (1 <= account && account <= size(balance_) && balance_[account - 1] >= money) {
+            balance_[account - 1] -= money;
+            return true;
+        }
+        return false;
+    }
+
+private:
+    vector<long long>& balance_;
+};