Streams & I/O

Foundation

Learn the invariant, apply it independently, then pass the Streams & I/O checkpoint.

• File line iterator (Medium)

Checkpoint

A graded check of the core Streams & I/O reasoning skills.

Pattern Quest

Practice recognizing streams & i/o problem shapes.

Streams & I/O

Practice incremental parsing, buffering, batching, iterator state, and partial reads so unbounded input can be processed without loading it all at once.

• Add Spaces Around Parentheses in a String (Easy)
• Binary tree in-order iterator (Medium)
• Check palindrome in stream (Easy)
• Clean directories recursively (Medium)
• Count words in file (Easy)
• Find files size larger than 5M (Medium)
• Find Kth largest in stream (Easy)
• Find median in stream (Hard)
• Merge K sorted streams in one (Hard)
• Rate limiter iterator (Medium)
• Reverse content of file in place (Easy)