/in/foo.cc: In function 'int main()':
/in/foo.cc:42:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for (int i = 0; i < repo.size(); i++)
                    ~~^~~~~~~~~~~~~
/in/foo.cc:57:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for (int i = 0; i < repo.size(); i++)
                    ~~^~~~~~~~~~~~~