/in/foo.cc: In function 'int main()':
/in/foo.cc:33:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for (int j = 0; j < names.size(); j++) {
                    ~~^~~~~~~~~~~~~~
/in/foo.cc:46:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for (int j = 0; j < adds.size(); j++) {
                    ~~^~~~~~~~~~~~~