THINK++ — Engineering Visualized

Includes

Header Files

Header files contain declarations of functions and classes. The #include directive copies the header contents into your file before compilation.

SYSTEM HEADERS

#include <iostream>
#include <vector>

Uses angle brackets — searched in system directories

USER HEADERS

#include "myfile.h"
#include "utils.h"

Uses quotes — searched in current directory first

Common STL Headers

<iostream>Input/Output streams (cin, cout)

<cmath>Math functions (sqrt, pow, abs)

<string>String class and operations

<vector>Dynamic array container

<algorithm>sort(), find(), max(), min()

<cstdlib>General utilities (rand, exit)

Use #include <bits/stdc++.h> to include everything at once. Only works with GCC — not portable, but saves time in contests.

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