In competitive programming, it is common for many programmers to use scanf() and printf() in C ++ code instead of using cin and cout .
And I've even seen problems that result in a Time Limit Exceeded (TLE) when used cin and cout , but run within time when scanf() is used printf() , implementing the same idea in the algorithms.
Then there is the question, scanf() is always faster than cin , will it depend on the case or cin is faster?