/in/foo.cc: In function 'int Delete(char*, int, char)':
/in/foo.cc:6:6: warning: unused variable 'i' [-Wunused-variable]
  int i,j;
      ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:23:18: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
  char s[100000]; gets(s);int len=strlen(s);
                  ^~~~
In file included from /usr/include/c++/6/cstdio:42:0,
                 from /usr/include/c++/6/ext/string_conversions.h:43,
                 from /usr/include/c++/6/bits/basic_string.h:5417,
                 from /usr/include/c++/6/string:52,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 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:23:24: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
  char s[100000]; gets(s);int len=strlen(s);
                        ^
In file included from /usr/include/c++/6/cstdio:42:0,
                 from /usr/include/c++/6/ext/string_conversions.h:43,
                 from /usr/include/c++/6/bits/basic_string.h:5417,
                 from /usr/include/c++/6/string:52,
                 from /usr/include/c++/6/bits/locale_classes.h:40,
                 from /usr/include/c++/6/bits/ios_base.h:41,
                 from /usr/include/c++/6/ios:42,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 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 Delete(char*, int, char)':
/in/foo.cc:20:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
/tmp/ccOsQ6N1.o: In function `main':
foo.cc:(.text.startup+0x19): warning: the `gets' function is dangerous and should not be used.