Given a Map<String, Object> representing a file system structure, calculate the total size of the directory including all subdirectories recursively. Map values are either Integers representing file sizes or nested Maps representing subdirectories.
This pattern mirrors roll-up summaries in hierarchical Salesforce data structures like Account hierarchies or custom object relationships.
Examples:
Input: directory = {'file1.txt' => 100, 'file2.txt' => 200}
Output: 300
Explanation: Two files with sizes 100 and 200 sum to 300
Input: directory = {'file1.txt' => 100, 'subfolder' => {'file2.txt' => 200, 'file3.txt' => 50}}
Output: 350
Explanation: file1.txt (100) plus subfolder contents (200 + 50) equals 350
Input: directory = {}
Output: 0
Explanation: Empty directory has size 0
Apex Code Editor
Welcome to Lightning Challenge!
How It Works
- • Write your solution in the code editor
- • Connect your Salesforce org to test
- • Submit to check if your solution passes
- • Use hints if you get stuck
Contest Alert
🏆 #CodeEveryDay October 2026 (Oct 4–15)Sponsored by FLXBL
Contest runs October 4 - 15. Complete challenges to climb the leaderboard!
Prizes 1 & 2: Salesforce certification exam voucher — won by random drawing, where every point is a ticket. see all prizes
Only the 12 daily challenges shown during this contest count toward points. Earlier dailies don't carry over.