In order to save critical time in competitive programming, it is crucial to read input as quickly as possible.
You’ve probably come across a number of problem statements that include the phrase “Warning: Large I/O data, be careful with certain languages (but most should be OK if the algorithm is adequately developed)” Utilizing Faster I/O techniques is the solution to such issues.
For quick input and output, scanf/printf is frequently advised in preference to cin/cout. However, by inserting the following two lines in your main() function, you may still utilize cin/cout and obtain the same speed as scanf/printf. It is advised to substitute cout “n”; for cout endl;. Endl forces an unneeded flushing stream, which makes it slower.
If it is called prior to the program’s first input or output operation, it turns on or off the synchronization of all standard C++ streams with their equivalent standard C streams. This synchronization can be avoided by adding ios base::sync with stdio (false); before any I/O action (which is true by default). It is a static member of the std::ios base function.
The procedure tie() merely ensures that std::cout flushes before std::int. cin will take a command. This is advantageous for interactive console programmes that necessitate continuous console updates but slows down the programme for heavy I/O. The NULL portion merely returns a pointer to NULL.
Additionally, you just need to use one include to include the standard template library (STL):
Thus, your model for competitive programming might be as follows:
using namespace std;
It is advised to substitute cout “n”; for cout endl;. Because endl demands a flushing stream, which is typically unnecessary, it takes longer. (You wouldn’t need to flush when writing a million lines of data; you would need to flush when creating, say, an interactive progress bar.) Instead of writing endl, use ‘n.
On the issue INTEST – Enormous Input Teston SPOJ, we can test our input and output techniques. We would recommend that you fix the problem first before continuing to read.