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++)
~~^~~~~~~~~~
