/in/foo.cc:9:7: error: stray '\357' in program
  if (r！=0)
       ^
/in/foo.cc:9:8: error: stray '\274' in program
  if (r！=0)
        ^
/in/foo.cc:9:9: error: stray '\201' in program
  if (r！=0)
         ^
/in/foo.cc: In function 'long long int dao(long long int)':
/in/foo.cc:9:12: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
  if (r！=0)
            ^
/in/foo.cc:5:16: warning: unused variable 'b' [-Wunused-variable]
  long long m,r,b;
                ^
/in/foo.cc:11:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^