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/ccrFQUsi.o: in function `main':
interface.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccuTO2ck.o:art.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status