Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:39:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[Nod].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:55:9: warning: unused variable ‘S’ [-Wunused-variable] int S = 0; ^ user.cpp:52:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arbore3.out", "w", stdout); ^