GH-313: Solve Leetcode 118 (#317)

Author: quang-ph

collections/leetcode/README.md

@@ -137,7 +137,7 @@
 <td>115</td>
 <td>116</td>
 <td>117</td>
-<td>118</td>
+<td>🟢&nbsp;<a href='https://github.com/rain1024/datastructures-algorithms-competitive-programming/tree/main/problems/leetcode118'>118</a></td>
 <td>119</td>
 <td>120</td>
 <tr>

collections/leetcode/data.yaml

@@ -66,6 +66,9 @@ problems:
 - name: 106
   languages: cpp
   level: medium
+- name: 118
+  languages: cpp
+  level: easy
 - name: 121
   languages: cpp
   level: easy

problems/leetcode118/.gitignore

@@ -0,0 +1,3 @@
+solution
+*.dSYM
+python/main/__pycache__

problems/leetcode118/README.md

@@ -0,0 +1,10 @@
+# Leetcode Problem 
+
+## Usage
+
+Test program
+
+```
+# Run all tests
+python solution_test.py
+```

problems/leetcode118/data/1.in

@@ -0,0 +1 @@
+5

problems/leetcode118/data/1.out

@@ -0,0 +1 @@
+[[1],[1,1],[1,2,1],[1,3,3,1],[1,4,6,4,1]]

problems/leetcode118/data/2.in

@@ -0,0 +1 @@
+1

problems/leetcode118/data/2.out

@@ -0,0 +1 @@
+[[1]]

problems/leetcode118/problem_infos.json

@@ -0,0 +1,8 @@
+{
+  "name": "118. Pascal's Triangle",
+  "link": "https://leetcode.com/problems/pascals-triangle/",
+  "tags": [
+    "Array",
+    "Dynamic Programming"
+  ]
+}

problems/leetcode118/python/main/solution.py

@@ -0,0 +1,12 @@
+from typing import List
+
+
+class Solution:
+    def generate(self, numRows: int) -> List[List[int]]:
+        ans = []
+        for i in range(numRows):
+            ans.append([1] * (i + 1))
+        for i in range(2, numRows):
+            for j in range(1, len(ans[i]) - 1):
+                ans[i][j] = ans[i - 1][j - 1] + ans[i - 1][j]
+        return ans

problems/leetcode118/python/tests/solution_test.py

@@ -0,0 +1,46 @@
+import sys
+import unittest
+from os import listdir
+from os.path import abspath, dirname, join
+
+python_source = dirname(dirname(abspath(__file__)))
+sys.path.append(python_source)
+from main.solution import Solution
+
+test_data_directory = join(dirname(python_source), 'data')
+test_cases = set([data_file.split('.')[0] for data_file in listdir(test_data_directory)])
+
+def read_input(input_file):
+    with open(input_file, 'r') as f:
+        val = int(f.readline().strip())
+    return val
+
+def read_output(output_file):
+    with open(output_file, 'r') as f:
+        k = f.readline().strip()
+        return k
+
+class TestSequenceMeta(type):
+    def __new__(mcs, name, bases, dict):
+
+        def gen_test(input_file, output_file):
+            def test(self):
+                solution = Solution()
+                val = read_input(input_file)
+                expected_k = read_output(output_file)
+                actual_k = solution.generate(val)
+                self.assertEqual(f'{actual_k}'.replace(' ',''), expected_k)
+            return test
+
+        for test_case in test_cases:
+            test_name = f'test_{test_case}'
+            input_file = join(test_data_directory, f'{test_case}.in')
+            output_file = join(test_data_directory, f'{test_case}.out')
+            dict[test_name] = gen_test(input_file, output_file)
+        return type.__new__(mcs, name, bases, dict)
+
+class TestSequence(unittest.TestCase, metaclass=TestSequenceMeta):
+    pass
+
+if __name__ == '__main__':
+    unittest.main()