python/Daily-Problem-1388/README.md

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+# Question 1388
+
+Good morning! Here's your coding interview problem for today.
+
+This problem was asked by Apple.
+
+Implement a queue using two stacks. Recall that a queue is a FIFO (first-in, first-out) data structure with the following methods: enqueue, which inserts an element into the queue, and dequeue, which removes it.
+
+## Implementation
+
+```
+Command: Push(1,2,3)
+
+LHS | 3 2 1
+RHS | 
+
+Command: Pop() -> Expect val of 1
+
+if RHS is not empty
+  return RHS.pop()
+
+while LHS is not empty:
+  RHS.push(LHS.pop())
+
+LHS | 
+RHS | 1 2 3
+
+return RHS.pop()
+
+RHS | 2 3
+
+
+
+
+
+
+```

python/Daily-Problem-1388/main.py

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+"""
+Tyler Perkins
+15-11-23
+
+Good morning! Here's your coding interview problem for today.
+
+This problem was asked by Apple.
+
+Implement a queue using two stacks. Recall that a queue is a FIFO (first-in, first-out) data structure with the following methods: enqueue, which inserts an element into the queue, and dequeue, which removes it.
+
+"""
+
+class Stack:
+    def __init__(self):
+        self._data = []
+
+    def push(self, val):
+        self._data.append(val)
+
+    def pop(self):
+        return self._data.pop()
+
+    def peek(self):
+        return self._data[-1]
+
+    def empty(self) -> bool:
+        return len(self._data) == 0
+
+
+class Queue:
+    """
+    Standard FILO Container
+    """
+    def __init__(self):
+        self._lhs = Stack()
+        self._rhs = Stack()
+        print("Made a new Queue")
+
+    def push(self, val):
+        """
+        Push a value into the back of the queue
+        """
+        print(f"Pushed value {val}")
+        self._lhs.push(val)
+
+    def pop(self):
+        """
+        Get the oldest value
+        """
+        if not self._rhs.empty():
+            ret = self._rhs.pop()
+            print(f"Pop value {ret}")
+            return ret
+
+        while not self._lhs.empty():
+            self._rhs.push(self._lhs.pop())
+
+        ret = self._rhs.pop()
+        print(f"Pop value {ret}")
+        return ret
+
+    def print(self):
+        print("Queue State")
+        print(f"self._lhs {self._lhs._data}")
+        print(f"self._rhs {self._rhs._data}")
+
+
+print("Testing Queue")
+q = Queue()
+
+q.push(1)
+q.push(2)
+q.push(3)
+
+q.print()
+
+assert q.pop() == 1
+assert q.pop() == 2
+assert q.pop() == 3
+
+q.print()
+
+q.push(4)
+q.push(5)
+
+q.print()
+
+assert q.pop() == 4
+
+q.print()
+
+q.push(6)
+
+q.print()
+
+assert q.pop() == 5
+
+q.print()
+