When should I use unitbuf flag?
Answer / Alok Narayan Pandey
The ios_base::sync_with_stdio(false) and std::cout.setf(std::ios::unitbuf) are used together in C++ to ensure that output operations on cout flush the buffer immediately after each operation, instead of buffering them for efficiency. This is useful when mixing C and C++ streams or dealing with interactive input/output.
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