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Polish queue from stacks challenge and solution (#74)

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Update constraints, algorithm discussion, and code.
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Donne Martin 2016-06-23 05:55:15 -04:00 committed by GitHub
parent 7f338b0e64
commit c7e9a85db7
2 changed files with 24 additions and 18 deletions
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16
stacks_queues/queue_from_stacks/queue_from_stacks_challenge.ipynb
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@ -34,9 +34,13 @@
"source": [ "source": [
"## Constraints\n", "## Constraints\n",
"\n", "\n",
"* Do you expect the methods to be enqueue and dequeue?\n", "* Do we expect the methods to be enqueue and dequeue?\n",
" * Yes\n", " * Yes\n",
"* Can we assume we already have a stack class that can be used for this problem?\n", "* Can we assume we already have a stack class that can be used for this problem?\n",
" * Yes\n",
"* Can we push a None value to the Stack?\n",
" * No\n",
"* Can we assume this fits memory?\n",
" * Yes" " * Yes"
] ]
}, },
@ -179,21 +183,21 @@
], ],
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22
stacks_queues/queue_from_stacks/queue_from_stacks_solution.ipynb
View File

@ -33,9 +33,13 @@
"source": [ "source": [
"## Constraints\n", "## Constraints\n",
"\n", "\n",
"* Do you expect the methods to be enqueue and dequeue?\n", "* Do we expect the methods to be enqueue and dequeue?\n",
" * Yes\n", " * Yes\n",
"* Can we assume we already have a stack class that can be used for this problem?\n", "* Can we assume we already have a stack class that can be used for this problem?\n",
" * Yes\n",
"* Can we push a None value to the Stack?\n",
" * No\n",
"* Can we assume this fits memory?\n",
" * Yes" " * Yes"
] ]
}, },
@ -65,7 +69,7 @@
"\n", "\n",
"### Enqueue\n", "### Enqueue\n",
"\n", "\n",
"* If the left stack is empty and the right stack is not empty\n", "* If right stack is not empty\n",
" * Shift the elements of the right stack to the left stack\n", " * Shift the elements of the right stack to the left stack\n",
"* Push the data to the left stack\n", "* Push the data to the left stack\n",
"\n", "\n",
@ -75,7 +79,7 @@
"\n", "\n",
"### Dequeue\n", "### Dequeue\n",
"\n", "\n",
"* If the right stack is empty and the the left stack is not empty\n", "* If the left stack is not empty\n",
" * Shift the elements of the left stack to the right stack\n", " * Shift the elements of the left stack to the right stack\n",
"* Pop from the right stack and return the data\n", "* Pop from the right stack and return the data\n",
"\n", "\n",
@ -130,12 +134,10 @@
" destination.push(source.pop())\n", " destination.push(source.pop())\n",
"\n", "\n",
" def enqueue(self, data):\n", " def enqueue(self, data):\n",
" if self.left_stack.is_empty() and not self.right_stack.is_empty():\n",
" self.shift_stacks(self.right_stack, self.left_stack)\n", " self.shift_stacks(self.right_stack, self.left_stack)\n",
" self.left_stack.push(data)\n", " self.left_stack.push(data)\n",
"\n", "\n",
" def dequeue(self):\n", " def dequeue(self):\n",
" if self.right_stack.is_empty() and not self.left_stack.is_empty():\n",
" self.shift_stacks(self.left_stack, self.right_stack)\n", " self.shift_stacks(self.left_stack, self.right_stack)\n",
" return self.right_stack.pop()" " return self.right_stack.pop()"
] ]
@ -236,21 +238,21 @@
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