/in/foo.cc: In function 'int main()':
/in/foo.cc:5:32: warning: unused variable 'tmp' [-Wunused-variable]
  int i=0, huahua=0, duishou=0, tmp = 0, flag = 1;
                                ^~~
/in/foo.cc:5:41: warning: unused variable 'flag' [-Wunused-variable]
  int i=0, huahua=0, duishou=0, tmp = 0, flag = 1;
                                         ^~~~