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Rework n pairs parens challenge (#145)

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Donne Martin
2017-02-08 06:36:49 -05:00
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parent 2f2e25c33d
commit a06617f0eb
4 changed files with 122 additions and 94 deletions
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84
recursion_dynamic/n_pairs_parentheses/n_pairs_parentheses_challenge.ipynb
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@@ -18,7 +18,7 @@
"cell_type": "markdown",
"metadata": {},
"source": [
"## Problem: Print all valid combinations of n-pairs of parentheses.\n",
"## Problem: Find all valid combinations of n-pairs of parentheses.\n",
"\n",
"* [Constraints](#Constraints)\n",
"* [Test Cases](#Test-Cases)\n",
@@ -33,7 +33,17 @@
"metadata": {},
"source": [
"## Constraints\n",
"* None"
"\n",
"* Is the input an integer representing the number of pairs?\n",
" * Yes\n",
"* Can we assume the inputs are valid?\n",
" * No\n",
"* Is the output a list of valid combinations?\n",
" * Yes\n",
"* Should the output have duplicates?\n",
" * No\n",
"* Can we assume this fits memory?\n",
" * Yes"
]
},
{
@@ -42,10 +52,14 @@
"source": [
"## Test Cases\n",
"\n",
"<pre>\n",
"* None -> Exception\n",
"* Negative -> Exception\n",
"* 0 -> []\n",
"* 1 -> [()]\n",
"* 2 -> [(()), ()()]\n",
"* 3 -> [((())), (()()), (())(), ()(()), ()()()]"
"* 1 -> ['()']\n",
"* 2 -> ['(())', '()()']\n",
"* 3 -> ['((()))', '(()())', '(())()', '()(())', '()()()']\n",
"</pre>"
]
},
{
@@ -72,17 +86,11 @@
},
"outputs": [],
"source": [
"def parentheses_util(no_left, no_right, pair_string, result):\n",
" # TODO: implement parentheses pairing here\n",
" pass\n",
"class Parentheses(object):\n",
"\n",
"\n",
"def pair_parentheses(n):\n",
" result_set = set()\n",
" if n == 0:\n",
" return result_set\n",
" parentheses_util(n, n, '', result_set)\n",
" return result_set"
" def find_pair(self, num_pairs):\n",
" # TODO: implement me\n",
" pass"
]
},
{
@@ -101,27 +109,30 @@
"outputs": [],
"source": [
"# %load test_n_pairs_parentheses.py\n",
"from nose.tools import assert_equal\n",
"from nose.tools import assert_equal, assert_raises\n",
"\n",
"\n",
"class TestPairParentheses(object):\n",
"\n",
" def test_pair_parentheses(self, solution):\n",
" assert_equal(solution(0), set([]))\n",
" assert_equal(solution(1), set(['()']))\n",
" assert_equal(solution(2), set(['(())', \n",
" '()()']))\n",
" assert_equal(solution(3), set(['((()))', \n",
" '(()())', \n",
" '(())()', \n",
" '()(())', \n",
" '()()()']))\n",
" def test_pair_parentheses(self):\n",
" parentheses = Parentheses()\n",
" assert_raises(TypeError, parentheses.find_pair, None)\n",
" assert_raises(ValueError, parentheses.find_pair, -1)\n",
" assert_equal(parentheses.find_pair(0), [])\n",
" assert_equal(parentheses.find_pair(1), ['()'])\n",
" assert_equal(parentheses.find_pair(2), ['(())',\n",
" '()()'])\n",
" assert_equal(parentheses.find_pair(3), ['((()))',\n",
" '(()())',\n",
" '(())()',\n",
" '()(())',\n",
" '()()()'])\n",
" print('Success: test_pair_parentheses')\n",
"\n",
"\n",
"def main():\n",
" test = TestPairParentheses()\n",
" test.test_pair_parentheses(pair_parentheses)\n",
" test.test_pair_parentheses()\n",
"\n",
"\n",
"if __name__ == '__main__':\n",
@@ -136,34 +147,25 @@
"\n",
"Review the [Solution Notebook](http://nbviewer.ipython.org/github/donnemartin/interactive-coding-challenges/blob/master/recursion_dynamic/n_pairs_parentheses/n_pairs_parentheses_solution.ipynb) for a discussion on algorithms and code solutions."
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": []
}
],
"metadata": {
"kernelspec": {
"display_name": "Python 2",
"display_name": "Python 3",
"language": "python",
"name": "python2"
"name": "python3"
},
"language_info": {
"codemirror_mode": {
"name": "ipython",
"version": 2
"version": 3
},
"file_extension": ".py",
"mimetype": "text/x-python",
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython2",
"version": "2.7.10"
"pygments_lexer": "ipython3",
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