이 코드에서 컴파일 에러가 나는데 왜 그런지 모르겠습니다. 도데체 뭐가 문제일까요? 

컴파일 에러 메시지는 이렇습니다

/tmp/ccpewNpt.o: In function `_GLOBAL__sub_I_n':
Main.cc:(.text.startup+0x12): relocation truncated to fit: R_X86_64_32 against `.bss'
Main.cc:(.text.startup+0x21): relocation truncated to fit: R_X86_64_32 against `.bss'
gcc-8.3.0/lib/gcc/x86_64-pc-linux-gnu/8.3.0/../../../../lib64/libstdc++.a(ios_init.o): In function `std::basic_streambuf<char, std::char_traits<char> >::basic_streambuf()':
/root/temp/language/gcc-8.3.0-build/x86_64-pc-linux-gnu/libstdc++-v3/include/streambuf:473:(.text._ZNSt8ios_base4InitC2Ev+0x42): relocation truncated to fit: R_X86_64_PC32 against symbol `__gnu_internal::buf_cout_sync' defined in .bss._ZN14__gnu_internal13buf_cout_syncE section in gcc-8.3.0/lib/gcc/x86_64-pc-linux-gnu/8.3.0/../../../../lib64/libstdc++.a(globals_io.o)
/root/temp/language/gcc-8.3.0-build/x86_64-pc-linux-gnu/libstdc++-v3/include/streambuf:473:(.text._ZNSt8ios_base4InitC2Ev+0x49): relocation truncated to fit: R_X86_64_PC32 against symbol `__gnu_internal::buf_cout_sync' defined in .bss._ZN14__gnu_internal13buf_cout_syncE section in gcc-8.3.0/lib/gcc/x86_64-pc-linux-gnu/8.3.0/../../../../lib64/libstdc++.a(globals_io.o)
/root/temp/language/gcc-8.3.0-build/x86_64-pc-linux-gnu/libstdc++-v3/include/streambuf:473:(.text._ZNSt8ios_base4InitC2Ev+0x54): relocation truncated to fit: R_X86_64_PC32 against symbol `__gnu_internal::buf_cout_sync' defined in .bss._ZN14__gnu_internal13buf_cout_syncE section in gcc-8.3.0/lib/gcc/x86_64-pc-linux-gnu/8.3.0/../../../../lib64/libstdc++.a(globals_io.o)
/root/temp/language/gcc-8.3.0-build/x86_64-pc-linux-gnu/libstdc++-v3/include/streambuf:473:(.text._ZNSt8ios_base4InitC2Ev+0x69): relocation truncated to fit: R_X86_64_PC32 against symbol `__gnu_internal::buf_cout_sync' defined in .bss._ZN14__gnu_internal13buf_cout_syncE section in gcc-8.3.0/lib/gcc/x86_64-pc-linux-gnu/8.3.0/../../../../lib64/libstdc++.a(globals_io.o)
/root/temp/language/gcc-8.3.0-build/x86_64-pc-linux-gnu/libstdc++-v3/include/streambuf:473:(.text._ZNSt8ios_base4InitC2Ev+0x74): relocation truncated to fit: R_X86_64_PC32 against symbol `__gnu_internal::buf_cout_sync' defined in .bss._ZN14__gnu_internal13buf_cout_syncE section in gcc-8.3.0/lib/gcc/x86_64-pc-linux-gnu/8.3.0/../../../../lib64/libstdc++.a(globals_io.o)
/root/temp/language/gcc-8.3.0-build/x86_64-pc-linux-gnu/libstdc++-v3/include/streambuf:473:(.text._ZNSt8ios_base4InitC2Ev+0x89): relocation truncated to fit: R_X86_64_PC32 against symbol `__gnu_internal::buf_cout_sync' defined in .bss._ZN14__gnu_internal13buf_cout_syncE section in gcc-8.3.0/lib/gcc/x86_64-pc-linux-gnu/8.3.0/../../../../lib64/libstdc++.a(globals_io.o)
/root/temp/language/gcc-8.3.0-build/x86_64-pc-linux-gnu/libstdc++-v3/include/streambuf:473:(.text._ZNSt8ios_base4InitC2Ev+0x94): relocation truncated to fit: R_X86_64_PC32 against symbol `__gnu_internal::buf_cout_sync' defined in .bss._ZN14__gnu_internal13buf_cout_syncE section in gcc-8.3.0/lib/gcc/x86_64-pc-linux-gnu/8.3.0/../../../../lib64/libstdc++.a(globals_io.o)
/root/temp/language/gcc-8.3.0-build/x86_64-pc-linux-gnu/libstdc++-v3/include/streambuf:473:(.text._ZNSt8ios_base4InitC2Ev+0xa3): relocation truncated to fit: R_X86_64_PC32 against symbol `__gnu_internal::buf_cout_sync' defined in .bss._ZN14__gnu_internal13buf_cout_syncE section in gcc-8.3.0/lib/gcc/x86_64-pc-linux-gnu/8.3.0/../../../../lib64/libstdc++.a(globals_io.o)
/root/temp/language/gcc-8.3.0-build/x86_64-pc-linux-gnu/libstdc++-v3/include/streambuf:473:(.text._ZNSt8ios_base4InitC2Ev+0xb6): additional relocation overflows omitted from the output
collect2: error: ld returned 1 exit status