art.cpp: In function 'void solve(int)':
art.cpp:28:16: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
28 | if(ans.size()<n){
| ~~~~~~~~~~^~
art.cpp:29:11: error: return-statement with a value, in function returning 'void' [-fpermissive]
29 | return 0;
| ^
art.cpp:34:9: error: return-statement with a value, in function returning 'void' [-fpermissive]
34 | return 0;
| ^
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) {
| ~~~~~~~~~^~~~