Efficiently write C/C++ code in competitive programming

In competitive programming, the most important thing is to write effective code. Optimization and faster code are important and can make a difference in a programmer's ranking.

In order to write effective C/C code in competitive programming, here are some effective tools for writing C/C code efficiently:

First, let’s review some basic terminology:

• Template is about writing code that does not depend on a specific type.

• Macro is a named snippet of code.

• Vectors are like dynamic arrays that automatically resize, updating the size by inserting and removing elements.

Now, let’s look at some basic updates that can make your code more efficient:

• Use faster input/output methods - scanf/printf are faster input and output methods.

• Assign variables using maximum and minimum values - Use the min-max function to reduce work.

• Creating range-based loops - For efficient coding, use range loops to iterate over arrays and vectors.

Example

Demonstration

#include<iostream>
using namespace std;
int main() {
   cout<<"Iterating over array using ranged array: ";
   int array[]= {6, 10, 31, 17, 50};
   for (const auto &value: array)
   cout<<value<<" "; return 0;
}

Output

Iterating over array using ranged array: 6 10 31 17 50

• Use the correct header files - Generally speaking, in C programming there are many different libraries used to include different functionality into the program. Header file: #include Contains almost all the files needed in competition programming. But when programming, make sure you need some of these functions before including this library. Otherwise, it may take up computational space.

• Use containers to reduce space - Containers such as vectors, maps, lists, etc. are used to solve many problems in competition programming question. Predefined functions on these containers reduce code size and make it more efficient.

• Use auto to declare data types because their types are defined at compile time.

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