/in/foo.cc: In function 'void pingpeng()':
/in/foo.cc:56:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     while (chars < strlen(match))
            ~~~~~~^~~~~~~~~~~~~~~
/in/foo.cc:104:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     while (chars < strlen(match))
            ~~~~~~^~~~~~~~~~~~~~~
/in/foo.cc:53:9: warning: unused variable 'games' [-Wunused-variable]
     int games = 0;
         ^~~~~