Tricks for C++ Simple App Development

This tutorial is not a primer guide, nor will there be much detail.

My scenarios: Algorithm Learning.

Switch to Linux

Compilers work faster on Linux most of the time, and many tools only run on Linux.

Fedora is the distribution I'm using.

Then you should install the GCC, on Fedora it's sudo dnf install gcc gcc-c++. Search "Install GCC Your Distribution" for more.


Install mold, follow "Install" at

Although we are just writing a simple app, mold still made the build a little faster.

VSCode and Clangd

Install VSCode for editing and Clangd Extension for intellisense.

Clangd is much faster than Microsoft's C/C++ extension.

Project Structure & Others

Create a folder named hello-cpp like this:

├─ build
├─ src
│  └─
└─ utils
   ├─ ld

./utils/ld is a link to $(which mold), or you can copy executable directly.

The content of ./utils/

# \time -f %e \
g++ ./src/ -o ./build/main -Butils -Wall -Wextra -g -fsanitize=address -fno-omit-frame-pointer
ulimit -t 1 # Avoid infinity loop
[ $? -eq 0 ] && ./build/main
# readelf -p .comment ./build/main

Switch -fsanitize=address is used to enable AddressSanitizer.

Then you can create a build task to execute ./utils/ and bind a key shortcut.

Include less headers

Don't include unnecessary headers. #include <bits/stdc++.h> caused heavily compile time, only use it when submitting to Online Judge.

Redirect cin

freopen("in.txt", "r", stdin) must create another file. Here a more concise way:

stringstream fcin(R"(1
1 2 3)");
istream std::cin(fcin.rdbuf());