Eroare de compilare: main.cpp: In function 'void dfs(int)': main.cpp:55:21: error: request for member 'find' in 'u.std::unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::operator[]<int, int, std::hash<int>, std::equal_to<int>, std::allocator<std::pair<const int, int> > >((sum[r] - s))', which is of non-class type 'std::unordered_map<int, int>::mapped_type {aka int}' if (u[sum[r]-s].find() != u.end()) ^~~~ main.cpp:59:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i<v[r].size(); i++) ~^~~~~~~~~~~~ main.cpp: In function 'char next()': main.cpp:19:35: 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, bsize, fin); ^ Non zero exit status: 1