Accepted
/in/foo.cc: In function 'int main()': /in/foo.cc:70:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < R.size(); i++) ~~^~~~~~~~~~ /in/foo.cc:81:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < R.size(); i++) ~~^~~~~~~~~~