encoder.cpp: In function 'void decode(int, int)':
encoder.cpp:36:17: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
36 | for(ll k=0;k<s.size();k++)
| ~^~~~~~~~~
/usr/bin/ld: /tmp/ccihoiV2.o: in function `decode(int, int)':
encoder.cpp:(.text+0xb2): undefined reference to `decode_bit()'
/usr/bin/ld: encoder.cpp:(.text+0x184): undefined reference to `hops(int, int, int)'
/usr/bin/ld: /tmp/ccshCw21.o: in function `main':
grader_encoder.c:(.text.startup+0x122): undefined reference to `encode(int, int, int, int*, int*)'
collect2: error: ld returned 1 exit status
/usr/bin/ld: /tmp/ccKd3LwK.o: in function `main':
grader_decoder.c:(.text.startup+0x126): undefined reference to `decode(int, int)'
collect2: error: ld returned 1 exit status