Update 8.py

1-100q/8.py

@@ -1,38 +1,34 @@
-class Solution:
-    def myAtoi(self, str):
-        """
-        :type str: str
-        :rtype: int
-        """
-        str = str.strip()
-        number = ""
-
-
-        for x in str:
-            if x.isalpha() and number == "":
-                return 0
-            elif x.isalpha():
-                break
-            elif x == ".":
-                break
-            elif x == " ":
-                break
-            elif (x == "+" or x == "-") and number == "":
-                number = number + x
-            elif (x == "+" or x == "-") and number != "":
-                break
-            elif (x == "+" or x == "-") and (number[-1] == "+" or number[-1] == "-"):
-                return 0
-            elif (x == "+" or x == "-") and ("+" in number or "-" in number):
-                break
-            elif x.isdigit():
-                number = number + x
-        if number == "" or number == "+" or number == "-":
-            return 0
+def myAtoi(s: str) -> int:
+    s = s.lstrip()
+
+    if not s:
+        return 0
+
+    # Determine sign
+    sign = 1
+    if s[0] == '-':
+        sign = -1
+        s = s[1:]
+    elif s[0] == '+':
+        s = s[1:]
+
+    # Convert the number
+    result = 0
+    for char in s:
+        if char.isdigit():
+            result = result * 10 + int(char)
         else:
-            if int(number) > ((2**31)-1):
-                return (2**31)-1
-            elif int(number) < -(2**31):
-                return -(2**31)
-            else:
-                return int(number)
+            break
+
+    # Apply sign
+    result *= sign
+
+    max = 2**31 - 1
+    min = -2**31
+
+    if result > max:
+        return max
+    if result < min:
+        return min
+
+    return result