/in/foo.cc: In function 'int main()':
/in/foo.cc:30:18: warning: unused variable 'i' [-Wunused-variable]
  long long m=1,n,i,j,c;
                  ^
/in/foo.cc:30:20: warning: unused variable 'j' [-Wunused-variable]
  long long m=1,n,i,j,c;
                    ^
/in/foo.cc:30:22: warning: unused variable 'c' [-Wunused-variable]
  long long m=1,n,i,j,c;
                      ^