interface.cpp: In function 'int publish(std::vector<int>)':
interface.cpp:20:17: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
20 | if(v.size() != N) {
| ~~~~~~~~~^~~~
interface.cpp: In function 'void answer(std::vector<int>)':
interface.cpp:36:17: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
36 | if(v.size() != N) {
| ~~~~~~~~~^~~~
/usr/bin/ld: /tmp/cc3IXBED.o: in function `solve(long)':
art.cpp:(.text+0x215): undefined reference to `publish(std::vector<long, std::allocator<long> >)'
/usr/bin/ld: art.cpp:(.text+0x4f3): undefined reference to `answer(std::vector<long, std::allocator<long> >)'
/usr/bin/ld: /tmp/cclCcT9H.o: in function `main':
interface.cpp:(.text.startup+0x16): undefined reference to `solve(int)'
collect2: error: ld returned 1 exit status