/in/foo.cc: In function 'bool pd(int)':
/in/foo.cc:14:47: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  if(y==1||y==3||y==5||y==7||y==8||y==10||y==12&&t<=31) return 1;
                                          ~~~~~^~~~~~~
/in/foo.cc:15:28: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  if(y==4||y==6||y==9||y==11&&t<=30) return 1;
                       ~~~~~^~~~~~~
/in/foo.cc:18:1: warning: control reaches end of non-void function [-Wreturn-type]
 } 
 ^