Why is scanf/printf preferred over cin/cout in C++ in case of large in put output?
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See this link on codechef, similar question is already answered here.
Scanf/printf is preferred because it is much faster than cin/cout which sometime might help avoiding TLE (Time Limit Exceeded).
You can read details here and here, also a google search will be helpful.
Also, getchar_unlocked() and other even faster methods exists, see it here and how it works here at stackoverflow.
A nice comparison of various I/O operations in C++ is given in this link => codeforces.
Note: Using faster I/O is not always sufficient (or important), you must always try to implement a fast algorithm to avoid TLE.
Refer this. The article explains why
scan, printf is faster than
cin, cout and also the test part of the fact that why it is true.
Nope cin/cout is faster than printf/scanf bec in c++ its have buffer memory which holds the input/output, when its full it gives to output so that programmer preferred cin/cout not printf/scanf
have a look at this
why is cin/cout slower than printf/scanf
I believe this is not true for cin() against scanf(), check this.
Maybe you are talking about
From personal experience,I have used both in a number of situations and found scanf to be faster than cin (although negligible, but may improve performance for very very large stdin input, but we handle them using file I/O).