hsknx
diff --git a/‎Medium/String to Integer (atoi).java
Lines changed: 30 additions & 0 deletions b/‎Medium/String to Integer (atoi).java
Lines changed: 30 additions & 0 deletions
diff --git a/‎Medium/String to Integer(atoi).java
Lines changed: 0 additions & 23 deletions b/‎Medium/String to Integer(atoi).java
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+class Solution {
+  public int myAtoi(String s) {
+    int idx = 0;
+    int n = s.length();
+    while (idx < n && s.charAt(idx) == ' ') {
+      idx++;
+    }
+    int sign = 1;
+    if (idx < n && (s.charAt(idx) == '-' || s.charAt(idx) == '+')) {
+      sign = s.charAt(idx) == '-' ? -1 : 1;
+      idx++;
+    }
+    if (idx == n || !Character.isDigit(s.charAt(idx))) {
+      return 0;
+    }
+    while (idx < n && s.charAt(idx) == '0') {
+      idx++;
+    }
+    int number = 0;
+    while (idx < n && Character.isDigit(s.charAt(idx))) {
+      int digit = Character.getNumericValue(s.charAt(idx));
+      if ((number > Integer.MAX_VALUE / 10) || (number == Integer.MAX_VALUE / 10 && digit > Integer.MAX_VALUE % 10)) {
+        return sign == 1 ? Integer.MAX_VALUE : Integer.MIN_VALUE;
+      }
+      number = number * 10 + digit;
+      idx++;
+    }
+    return number * sign;
+  }
+}