first commit

accepted/accepted_medium.py

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+from typing import List
+
+
+class AcceptedMedium:
+    def reverse_int(self, x: int) -> int:
+        """
+            Link: https://leetcode.com/problems/reverse-integer/
+            Runtime: 36 ms
+        """
+        ctr = 1
+        if x < 0:
+            ctr = -1
+            x *= -1
+
+        nr = 0
+        while x > 0:
+            nr = (nr + (x % 10)) * 10
+            x //= 10
+        nr //= 10
+
+        return nr * ctr if -2147483648 <= nr <= 2147483647 else 0
+
+    def letter_combinations(self, digits: str) -> List[str]:
+        """
+            Link: https://leetcode.com/problems/letter-combinations-of-a-phone-number/
+            Runtime: 39 ms
+        """
+        # sourcery skip: use-itertools-product
+        number_to_string = {'2': ['a', 'b', 'c'], '3': ['d', 'e', 'f'], '4': ['g', 'h', 'i'],
+                    '5': ['j', 'k', 'l'], '6': ['m', 'n', 'o'], '7': ['p', 'q', 'r', 's'],
+                    '8': ['t', 'u', 'v'], '9': ['w', 'x', 'y', 'z']}
+        
+        l = ['']
+        l2 = []
+
+        for n in digits:
+            for s in number_to_string[n]:
+                for i in l:
+                    l2.append(i+s)
+            l = l2.copy()
+            l2 = []
+        return [] if l[0] == '' else l