VS Code Suddenly Not Running C++ Code – Possible GCC/Environment Issue

My code was running well yesterday, but now, suddenly, the same code is not running and is showing some problems. How can I fix this?

Note that I had run a Python code earlier. I don't know if this issue is being caused by the Python environment settings or not. However, after running the Python code, I also ran the C++ code, and it worked fine. But the next day, it suddenly stopped working. How can I fix this issue?