/in/foo.cc: In function 'int main()':
/in/foo.cc:56:13: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
             gets(a);
             ^~~~
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:56:19: warning: 'char* gets(char*)' is deprecated [-Wdeprecated-declarations]
             gets(a);
                   ^
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__;
              ^~~~
/tmp/ccqRgGxj.o: In function `main':
foo.cc:(.text.startup+0x8c): warning: the `gets' function is dangerous and should not be used.
foo.cc:(.text.startup+0x1a): relocation truncated to fit: R_X86_64_PC32 against symbol `a' defined in .bss section in /tmp/ccqRgGxj.o
foo.cc:(.text.startup+0x2b): relocation truncated to fit: R_X86_64_PC32 against symbol `n' defined in .bss section in /tmp/ccqRgGxj.o
foo.cc:(.text.startup+0x54): relocation truncated to fit: R_X86_64_PC32 against symbol `n' defined in .bss section in /tmp/ccqRgGxj.o
foo.cc:(.text.startup+0x64): relocation truncated to fit: R_X86_64_PC32 against symbol `j' defined in .bss section in /tmp/ccqRgGxj.o
foo.cc:(.text.startup+0x6e): relocation truncated to fit: R_X86_64_PC32 against symbol `i' defined in .bss section in /tmp/ccqRgGxj.o
foo.cc:(.text.startup+0x81): relocation truncated to fit: R_X86_64_PC32 against symbol `aa' defined in .bss section in /tmp/ccqRgGxj.o
foo.cc:(.text.startup+0x93): relocation truncated to fit: R_X86_64_PC32 against symbol `aa' defined in .bss section in /tmp/ccqRgGxj.o
foo.cc:(.text.startup+0xaf): relocation truncated to fit: R_X86_64_PC32 against symbol `aa' defined in .bss section in /tmp/ccqRgGxj.o
foo.cc:(.text.startup+0x10f): relocation truncated to fit: R_X86_64_PC32 against symbol `i' defined in .bss section in /tmp/ccqRgGxj.o
foo.cc:(.text.startup+0x118): relocation truncated to fit: R_X86_64_PC32 against symbol `n' defined in .bss section in /tmp/ccqRgGxj.o
foo.cc:(.text.startup+0x11e): additional relocation overflows omitted from the output
collect2: error: ld returned 1 exit status