Compilare: user.cpp: In function ‘void get_nodes_at_dist(int, int, bool)’: user.cpp:117:55: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int vecin = 0; vecin < vecini[node].size(); ++ vecin) { ^ user.cpp:129:55: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int vecin = 0; vecin < vecini[node].size(); ++ vecin) { ^ user.cpp: In function ‘bool add(int, int)’: user.cpp:201:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < aux_a.size(); ++ i) ^ user.cpp:202:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (RAD - i - 1 < aux_b.size()) { ^ user.cpp: In function ‘bool erase(int, int)’: user.cpp:255:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < aux_a.size(); ++ i) ^ user.cpp:256:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (RAD - i - 1 < aux_b.size()) { ^ user.cpp: In function ‘int main()’: user.cpp:299:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < ans.size(); ++ i) ^ user.cpp: In constructor ‘InputReader::InputReader(const char*)’: user.cpp:16:47: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, SIZE, 1, input_file); ^ user.cpp: In member function ‘void InputReader::advance()’: user.cpp:38:51: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, SIZE, 1, input_file); ^