Compilare: user.cpp: In function ‘int solve()’: user.cpp:25:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < graph[adj].size(); i++) { ^ user.cpp:38:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:54:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < ans.size() - 1; i++) ^