To use the `-DNDEBUG` flag with g++, you can pass it as an argument when compiling your code. For example, if your source code is in a file called example.cpp, you can compile it with the `-DNDEBUG` flag like this:
```c++
g++ -DNDEBUG example.cpp -o example
```
This will compile your code with the NDEBUG macro defined, which will cause the assert statements to be ignored during compilation.
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