/in/foo.cc: In function 'bool JS(ll)':
/in/foo.cc:11:15: error: 'A' was not declared in this scope
   if(t[i]-mid*A>0){
               ^
/in/foo.cc:12:24: error: invalid types 'll {aka long long int}[int]' for array subscript
      ll t=ceil(1.0*(t[i]-mid*A)/B);  //需要使用纸扇的时间 
                        ^
/in/foo.cc:12:33: error: 'B' was not declared in this scope
      ll t=ceil(1.0*(t[i]-mid*A)/B);  //需要使用纸扇的时间 
                                 ^