/in/foo.cc: In function 'void DFS(int, int, ll)':
/in/foo.cc:22:8: warning: unused variable 'j' [-Wunused-variable]
  int i,j,k,v;
        ^
/in/foo.cc:22:10: warning: unused variable 'k' [-Wunused-variable]
  int i,j,k,v;
          ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:36:14: warning: unused variable 'j' [-Wunused-variable]
  int x,y,z,i,j,k;
              ^
/in/foo.cc:36:16: warning: unused variable 'k' [-Wunused-variable]
  int x,y,z,i,j,k;
                ^