if(CMAKE_CXX_COMPILER_ID MATCHES GNU)
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wno-unknown-pragmas -Wno-sign-compare -Woverloaded-virtual -Wwrite-strings -Wno-unused")
    set(CMAKE_CXX_FLAGS_RELEASE "-Ofast -march=native -DNDEBUG -Wno-unused")
    set(CMAKE_CXX_FLAGS_DEBUG "-O0 -DDEBUG -g")
endif()