auto commit

notes/剑指 offer 题解.md

@@ -1082,7 +1082,7 @@ false
 
 ```java
 public boolean isNumeric(char[] str) {
-    if (str == null)
+    if (str == null || str.length == 0)
         return false;
     return new String(str).matches("[+-]?\\d*(\\.\\d+)?([eE][+-]?\\d+)?");
 }