Compilare: user.cpp: In function ‘int main()’: user.cpp:38:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; setTrenuri.size() < m && j < get<1>(tren[i]); j++) ^ user.cpp:20:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("trenuri3.out", "w", stdout); ^