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Fast Input and Output (FastIO) is expressed as a method amongst developers to speed up data transfer. In competitive programming, FastIO is seen as a unique approach to optimize the reading and writing operations, thus speeding up the whole coding process.
In C++, we often use cin and cout for input and output respectively. However, they are known to be slower when dealing with a large amount of data. Therefore, a method for implementing FastIO in C++ was introduced.
FastIO Solution
The concept of Fastio is to unlink the synchronization of standard C++ streams with their C counterparts, which can significantly improve processing speed. Now we will go through the code implementation method.
#include
using namespace std;
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(NULL);
//your code here
return 0;
}
Understanding the Code
In the code snippet above, ‘ios_base::sync_with_stdio(false)’ is employed. This line allows the C++ streams to be standalone and not to be synchronized with their C counterparts. This statement significantly reduces the time taken for input and output stream operations.
The ‘cin.tie(NULL)’ statement detaches the cin and cout. Generally, before each input operation, the output buffer is flushed. With this command, we are connecting the cin and cout to NULL to prevent this flushing from taking place, leading to faster execution.
C++ Libraries and Functions
C++ incorporates a rich library support that allows FastIO. The ‘bits/stdc++.h’ in the code above is an example of a library that includes all the standard C++ libraries, ensuring the developer does not have to incorporate them individually.
The ‘ios_base’ is a class provided by C++ to control the characteristics of input/output operations. Functions like ‘sync_with_stdio’ and ‘tie’ are inbuilt functions of this class used to speed up data processing.
There’s much more to learn and explore in the world of C++ programming and speed optimization. FastIO is a minor part of it, although a crucial one, particularly in the field of competitive programming. Understanding and mastering it undoubtedly gives the programmer an edge over others.
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