If you like GeeksforGeeks and would like to contribute, you can also write an article using or mail your article to See your article appearing on the GeeksforGeeks main page and help other Geeks. This article is contributed by Shubham Bansal. Ultimately, by using these smart tricks you can easily write code in a minimum amount of time and words. Try to learn different functions available in algorithm library of C++.They are useful most of the times in programs

Libraries and pre-defined functions: Using builtin functions such as _gcd(A,B), swap, _builtin_popcount(R), _builtin_clz(R) etc wherever that can be applied.

When a variable is defined as auto, compiler determines its type during compile-time.

auto: Using auto to declare datatypes can save lot of time during programming contests.

Fast cin and cout: If you use cin and cout for I/O, just add the following line just after the main().

Containers: Using various containers like vector, list, map etc enables one to use the pre-defined functions and reduces the size of code considerably (more often than not).

Using “bits/stdc++.h”: Instead of adding tons of #include lines, just use #include The files includes all the header files you’ll need in competitive programming, saving a lot of your time.

Initialize a vector in C++ (7 different ways).

Map in C++ Standard Template Library (STL).

Sort in C++ Standard Template Library (STL).

The C++ Standard Template Library (STL).

Vector of Vectors in C++ STL with Examples.

2D Vector In C++ With User Defined Size.

How to pass a 2D array as a parameter in C?.

How to dynamically allocate a 2D array in C?.

Dynamic Memory Allocation in C using malloc(), calloc(), free() and realloc().

Difference Between malloc() and calloc() with Examples.

How to deallocate memory without using free() in C?.

Initialization of static variables in C.

Understanding “volatile” qualifier in C | Set 2 (Examples).

What are the default values of static variables in C?.

Array algorithms in C++ STL (all_of, any_of, none_of, copy_n and iota).

Writing C/C++ code efficiently in Competitive programming.

ISRO CS Syllabus for Scientist/Engineer Exam.

ISRO CS Original Papers and Official Keys.

GATE CS Original Papers and Official Keys.

Far manager c++