/in/foo.cc: In function 'void work(int)':
/in/foo.cc:50:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i = 0; i < record.size(); ++i) {
                  ~~^~~~~~~~~~~~~~~
/in/foo.cc:60:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while(st != record.size()) {
         ~~~^~~~~~~~~~~~~~~~
/in/foo.cc:70:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    if(abs(nW - nL) >= 2 || ed == record.size()) {
                            ~~~^~~~~~~~~~~~~~~~