Two Tasks

8. String to Integer (atoi)/Solution.cs

@@ -0,0 +1,27 @@
+using System.Numerics;
+
+namespace _8._String_to_Integer__atoi_;
+
+public class Solution {
+    public int MyAtoi(string s)
+    {
+        if (string.IsNullOrEmpty(s))
+            return 0;
+        BigInteger res = 0;
+        int index = 0;
+        while (index<s.Length && s[index] == ' ')
+            index++;
+        bool negative = index<s.Length && s[index] == '-';
+        if (index<s.Length && "+-".Contains(s[index]))
+            index++;
+        while (index<s.Length && char.IsDigit(s[index]))
+            res = res * 10 + s[index++]-'0';
+        if (negative)
+            res *= -1;
+        if (res > int.MaxValue)
+            return int.MaxValue;
+        if (res < int.MinValue)
+            return int.MinValue;
+        return (int)res;
+    }
+}