Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:39:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[x].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:64:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(ans.size() != m + 1) ^ user.cpp:67:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < ans.size(); ++i) ^