/in/foo.cc: In function 'void bfs()':
/in/foo.cc:45:8: warning: unused variable 'j' [-Wunused-variable]
  int i,j,u,v,l=1,r=0,op;
        ^
/in/foo.cc: In function 'void AC(char*)':
/in/foo.cc:69:30: warning: unused variable 'j' [-Wunused-variable]
  int u=0,len=strlen(s),c,k,i,j;
                              ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:85:8: warning: unused variable 'j' [-Wunused-variable]
  int i,j,k,T;
        ^
/in/foo.cc:85:10: warning: unused variable 'k' [-Wunused-variable]
  int i,j,k,T;
          ^