# Introduction In this challenge, we will be upgrading the LabEx environment to support a newer standard compiler, specifically C++11. We will also be implementing the `printf` function in C++ using a provided code file. It is important to note that only the content between `TODO START` and `TODO END` should be modified, and the number of lines should not be changed. Additionally, we need to ensure that the code compiles without warnings and the output matches the expected output. Lastly, we should consider the runtime performance of our code, with the last line of output being a number less than 200.
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