[Add] Leetcode > 7. Reverse Integer

Author: Joie-Kim

Leetcode/reverse_integer.py

@@ -0,0 +1,38 @@
+# 7. Reverse Integer
+
+# (1) 정수 사용하기 (54 ms)
+class Solution:
+    def reverse(self, x: int) -> int:
+        if x < 0:
+            sign = -1
+            x = -x
+        else:
+            sign = 1
+        
+        result = 0
+        while x:
+            result = (result * 10) + (x % 10)
+            x = x // 10
+        
+        if -2**31 > result or 2**31 - 1 < result:
+            return 0
+        
+        return result * sign
+
+# (2) 문자열 사용하기 (37 ms)
+class Solution:
+    def reverse(self, x: int) -> int:
+        if x < 0:
+            sign = -1
+            x = -x
+        else:
+            sign = 1
+        
+        x_string = str(x)
+        result_string = x_string [::-1]
+        result = int(result_string)
+        
+        if -2**31 > result or 2**31 - 1 < result:
+            return 0
+        
+        return result * sign