/in/foo.cc: In function 'void crf(int)':
/in/foo.cc:80:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
                 for(int j=0;j<strlen(d[i]);++j)
                             ~^~~~~~~~~~~~~
/in/foo.cc:98:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
                 for(int j=0;j<strlen(c[i]);++j)
                             ~^~~~~~~~~~~~~
/in/foo.cc:116:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
                 for(int j=0;j<strlen(c[i]);++j)
                             ~^~~~~~~~~~~~~
/in/foo.cc:121:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
                 for(int j=0;j<strlen(c[i]);++j)
                             ~^~~~~~~~~~~~~
/in/foo.cc:125:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
                 for(int j=0;j<strlen(d[i]);++j)
                             ~^~~~~~~~~~~~~
/in/foo.cc:130:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
                 for(int j=0;j<strlen(c[i]);++j)
                             ~^~~~~~~~~~~~~