🐛 Bug Bounty #04: String concat in a hot loop

← Courses›Creative ChallengesModule 4 · 🐛 Bug Bounty (10)›🐛 Bug Bounty #04: String concat in a hot loopfix34 / 100

Task

📝 **Task:** Replace the quadratic-time `+=` with a linear `join`.

📋 Implement the function above. Tests run automatically.

💡 **Hint:** Re-read the theory if stuck.

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🎨fix

🐛 Bug Bounty #05: Average of an empty list

🎨fix

🕵️ Case 02: The Mutable Default Argument

🎨fix

🕵️ Case 03: The Floating-Point Money Heist

🤖predictFREE

Prerequisites — what you should know before this track

⚡predictFREE

Prerequisites — what you should know before this track

✏️ Write your code here

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📊 Result

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💬 Discussion