/in/foo.cc: In function 'long long int Check()':
/in/foo.cc:29:9: warning: unused variable 'K' [-Wunused-variable]
  LL I,J,K;
         ^
/in/foo.cc: In function 'void DFS(long long int, long long int)':
/in/foo.cc:43:7: warning: unused variable 'J' [-Wunused-variable]
  LL I,J,K;
       ^
/in/foo.cc:43:9: warning: unused variable 'K' [-Wunused-variable]
  LL I,J,K;
         ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:62:7: warning: unused variable 'J' [-Wunused-variable]
  LL I,J,K;
       ^
/in/foo.cc:62:9: warning: unused variable 'K' [-Wunused-variable]
  LL I,J,K;
         ^