/in/foo.cc:5:11: error: stray '\357' in program
    5 |  cin>>a>>b；
      |           ^
/in/foo.cc:5:12: error: stray '\274' in program
    5 |  cin>>a>>b；
      |            ^
/in/foo.cc:5:13: error: stray '\233' in program
    5 |  cin>>a>>b；
      |             ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:5:11: error: expected ';' before 'sum'
    5 |  cin>>a>>b；
      |           ^
      |           ;
    6 |   sum=a+b
      |   ~~~      
/in/foo.cc:4:10: warning: unused variable 'sum' [-Wunused-variable]
    4 |  int a,b,sum;
      |          ^~~