Strings · Coding problem
Longest Common Prefix
A free coding problem from the String Prefix Comparison skill. Read it here, then solve it in the app in Java or Python.
- Easy
- Coding problem
- Free
- Java and Python
The problem
Find the longest string that every word in strs starts with. If the words don't all share even a first letter, return an empty string.
Example
Input: strs = ["interview", "internet", "interval"]
Output: inter
Constraints
1 <= strs.length <= 2001 <= strs[i].length <= 200(the strings are read as space-separated words, so none is empty)strs[i]consists of lowercase English letters
How it's graded
- Run checks your code against the examples. Submit also runs a hidden suite in four groups - basic cases, edge cases, random inputs and performance tests at the size limit - and shows which groups pass, never the hidden inputs.
- Stuck? Hints come in four steps, from a nudge to a code skeleton, each costing part of the points.
- Once you pass, you see the approaches from brute force to optimal, and where your solution lands among them.
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