foo.cc:7:3: error: unterminated comment
    7 |   /*
      |   ^
foo.cc: In function 'int main()':
foo.cc:5:8: warning: unused variable 'n' [-Wunused-variable]
    5 |  int m,n=0,sum=0;
      |        ^
foo.cc:5:12: warning: unused variable 'sum' [-Wunused-variable]
    5 |  int m,n=0,sum=0;
      |            ^~~
foo.cc:6:9: error: expected '}' at end of input
    6 |   cin>>m;
      |         ^
foo.cc:4:1: note: to match this '{'
    4 | {
      | ^

[Hydro](https://hydro.ac)提供评测服务