/in/foo.cc: In function 'int main()':
/in/foo.cc:99:2: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
  gets(a1);
  ^~~~
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:99:9: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
  gets(a1);
         ^
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: In function 'int mul(int*, int, int)':
/in/foo.cc:14:9: warning: 'point' may be used uninitialized in this function [-Wmaybe-uninitialized]
  point++;
         ^
/in/foo.cc: In function 'int mul1(int*, int, int*, int, int*, int)':
/in/foo.cc:48:9: warning: 'point' may be used uninitialized in this function [-Wmaybe-uninitialized]
  point++;
         ^
/tmp/ccnAWAXn.o: In function `main':
foo.cc:(.text.startup+0xf): warning: the `gets' function is dangerous and should not be used.