Problem Description
You are given an array of strings words and a string pref. Return the number of strings in words that contain pref as a prefix. A prefix of a string s is any leading contiguous substring of s.
Key Insights
- We need to iterate through the array of strings.
- For each string, we check if it starts with the given prefix.
- The count of such strings is our final answer.
- Prefix checking can be efficiently done using built-in string methods.
Space and Time Complexity
Time Complexity: O(n * m), where n is the number of strings in words and m is the average length of the strings.
Space Complexity: O(1), since we are using a constant amount of extra space for counting.
Solution
To solve the problem, we will iterate through each string in the words array and use a string method to check if the string starts with the specified pref. We will maintain a count of how many strings satisfy this condition.