Compilare: user.cpp: In function ‘void apm()’: user.cpp:43:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[1].size(); i++) ^ user.cpp:68:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[act.to].size(); i++) ^ user.cpp: In function ‘int dfs(int, int)’: user.cpp:89:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<ap[nod].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:112:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("online.in","r",stdin); ^ user.cpp:113:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("online.out","w",stdout); ^