Eroare de compilare: user.cpp:10:13: error: variable ‘std::ifstream fin’ has initializer but incomplete type ifstream fin("bilete.in"); ^ user.cpp:11:14: error: variable ‘std::ofstream fout’ has initializer but incomplete type ofstream fout("bilete.out"); ^ user.cpp: In function ‘int main()’: user.cpp:69:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bilete.in", "r", stdin); ^ user.cpp:70:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bilete.out", "w", stdout); ^ user.cpp:71:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &M); ^