/in/foo.cc: In function 'int main()':
/in/foo.cc:69:4: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
    gets(Q[i]+1);
    ^~~~
In file included from /usr/include/c++/6/cstdio:42:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:46,
                 from /in/foo.cc:1:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/in/foo.cc:69:15: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
    gets(Q[i]+1);
               ^
In file included from /usr/include/c++/6/cstdio:42:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:46,
                 from /in/foo.cc:1:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/in/foo.cc:89:3: warning: label 's' defined but not used [-Wunused-label]
   s:;
   ^
/in/foo.cc:92:16: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
    DFS(x,y,0,i);
                ^
/in/foo.cc:92:16: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]
/tmp/ccDBYttT.o: In function `main':
foo.cc:(.text.startup+0x60): warning: the `gets' function is dangerous and should not be used.