/in/foo.cc: In function 'void bfs()':
/in/foo.cc:45:11: 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:69:33: 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:85:11: warning: unused variable 'j' [-Wunused-variable]
     int i,j,k,T;
           ^
/in/foo.cc:85:13: warning: unused variable 'k' [-Wunused-variable]
     int i,j,k,T;
             ^