You can debug on your computer using any tool that you like. When coding in our online editor, anything printed to STDOUT will be matched against the challenge's Expected Output (so printing debug statements there could cause you to fail the challenge). If your submission language supports printing to STDERR (e.g., cerr for C++, System.err.println for Java, console.error for JavaScript, etc.), you can send your debug output there and it will show up in a separate Error box underneath the challenge's Expected Output.
How do I debug my code?
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