/in/foo.cc: In function 'void calc(int)':
/in/foo.cc:11:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if (c.size() > m || c.size() + n - x + 1 < m) { return; }
         ~~~~~~~~~^~~
/in/foo.cc:11:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if (c.size() > m || c.size() + n - x + 1 < m) { return; }
                         ~~~~~~~~~~~~~~~~~~~~~^~~