Eroare de compilare: user.cpp: In function ‘void dfsx(int, long long int)’: user.cpp:51:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<vn.size();++i) { ^ user.cpp: In function ‘int main()’: user.cpp:65:16: error: variable ‘std::fstream fin’ has initializer but incomplete type fstream fin("riremito.in"); ^ user.cpp:66:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("riremito.out","w",stdout); ^ user.cpp:75:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&K); ^ user.cpp:79:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&start); ^