/in/foo.cc: In function 'int main()':
/in/foo.cc:8:2: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
  gets(s);
  ^~~~
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:8:8: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
  gets(s);
        ^
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:36:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  } else if (k > strlen(s) - i) {
             ~~^~~~~~~~~~~~~~~
/in/foo.cc:38:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int n = 0; n < k - strlen(s) + i+1; n++)
                   ~~^~~~~~~~~~~~~~~~~~~~~
/in/foo.cc:9:6: warning: 'm' may be used uninitialized in this function [-Wmaybe-uninitialized]
  int m ;
      ^
/tmp/ccOr2QYk.o: In function `main':
foo.cc:(.text.startup+0x11): warning: the `gets' function is dangerous and should not be used.