Maximum Value of a String in an Array

To solve this problem, we need to loop over the given list of strings and find the maximum value of any string. For each string, we need to check if it contains only digits or it contains alphanumeric characters. We can do this by using the isdigit() method which returns True if all the characters are digits, else False.

If the string contains only digits, we take the integer value of the string as its value. If the string contains alphanumeric characters, we take the length of the string as its value.

Then, we compare the value of the string with the current maximum value and update the maximum value if the value of the string is greater.

Here is the Python code:

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class Solution:
    def maximumValue(self, strs: List[str]) -> int:
        # Initialize the maximum value to be -1
        max_value = -1

        # Iterate over the list of strings
        for s in strs:
            # If the string contains only digits
            if s.isdigit():
                # Update the maximum value with the integer value of the string
                max_value = max(max_value, int(s))
            else:
                # Update the maximum value with the length of the string
                max_value = max(max_value, len(s))

        # Return the maximum value
        return max_value

This solution iterates over each string in the list, checks if it is made of digits only, and uses the appropriate value calculation. It keeps track of the maximum value found and returns it.