C++ (GCC) Online Compiler & Code Runner
Our online C++ compiler lets you compile and run C++17 and C++20 code in seconds without installing GCC, MinGW, or Visual Studio. Complete with STL algorithms, vectors, maps, and competitive programming headers (`<bits/stdc++.h>`).
Modern C++20 Standard
Write modern C++ with ranges, concepts, vectors, and lambdas.
Full STL & bits/stdc++.h
Includes standard template library: map, set, unordered_map, queue, and priority_queue.
Standard Input (stdin)
Input test cases easily to test competitive programming code.
Cached Compiler Performance
High-speed backend runners provide rapid compilation and execution feedback.
Popular C++ (GCC) Examples
Basic I/O & cin/cout
Fast I/O and reading input from stdin in C++.
#include <iostream>
using namespace std;
int main() {
string name;
if (cin >> name) {
cout << "Hello, " << name << "!" << endl;
} else {
cout << "Hello, World!" << endl;
}
return 0;
}Binary Search (STL)
Lower bound and binary search using C++ STL algorithms.
#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
int main() {
vector<int> v = {1, 3, 5, 7, 9};
bool found = binary_search(v.begin(), v.end(), 5);
cout << "Found 5: " << (found ? "Yes" : "No") << endl;
return 0;
}Ready to Practice Real Interview Problems in C++?
Solve 370 curated problems merged from Striver A2Z, Love Babbar 450, and Apna College with zero duplicate questions.
Frequently Asked Questions
Can I use bits/stdc++.h in this C++ compiler?
Yes, standard GCC `<bits/stdc++.h>` is fully supported for competitive programming practice.
What C++ standard is enabled?
Code is compiled with modern C++ standards (C++17 / C++20) by default.