foo.cc: In function 'int main()':
foo.cc:47:8: warning: unused variable 'j' [-Wunused-variable]
  int i,j,k;
        ^
foo.cc:47:10: warning: unused variable 'k' [-Wunused-variable]
  int i,j,k;
          ^
foo.cc:48:6: warning: unused variable 'x' [-Wunused-variable]
  int x,y,z;
      ^
foo.cc:48:8: warning: unused variable 'y' [-Wunused-variable]
  int x,y,z;
        ^
foo.cc:48:10: warning: unused variable 'z' [-Wunused-variable]
  int x,y,z;
          ^

自豪的采用jd5进行评测(github.com/masnn/jd5)