art.cpp:5:9: warning: ISO C++11 requires whitespace after the macro name
5 | #define fast_io; ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
| ^~~~~~~
art.cpp: In function 'void solve(ll)':
art.cpp:16:18: error: 'publish' was not declared in this scope
16 | b[i]=publish(c);
| ^~~~~~~
art.cpp:24:7: error: 'answer' was not declared in this scope
24 | answer(a);
| ^~~~~~
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) {
| ~~~~~~~~~^~~~