/in/foo.cc: In function 'void init()':
/in/foo.cc:61:29: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
         scanf("%d%d",&j,&k);gets(c);
                             ^~~~
In file included from /usr/include/c++/6/cstdio:42:0,
                 from /in/foo.cc:5:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/in/foo.cc:61:35: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
         scanf("%d%d",&j,&k);gets(c);
                                   ^
In file included from /usr/include/c++/6/cstdio:42:0,
                 from /in/foo.cc:5:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/tmp/cc1zy5mI.o: In function `init()':
foo.cc:(.text._Z4initv[_Z4initv]+0x9b): warning: the `gets' function is dangerous and should not be used.