Compilare: user.cpp: In function ‘std::vector<long long int> dfs(int)’: user.cpp:18:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (aux.size() < i) ~~~~~~~~~~~^~~ user.cpp: In function ‘int main()’: user.cpp:100:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("craciun.out", "w", stdout); ^ user.cpp: In member function ‘char InParser::read_ch()’: user.cpp:45:34: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, 262144, fin); ^