/in/foo.cc: In function 'bool sb(int)':
/in/foo.cc:20:6: warning: unused variable 'i' [-Wunused-variable]
  int i=7;
      ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:32:8: warning: unused variable 'm' [-Wunused-variable]
  int n,m;
        ^