Compilare: user.cpp: In function ‘int dfs(int, int)’: user.cpp:50:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < g[node].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:92:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < repres.size(); ++i) ^ user.cpp:95:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < cp.size(); ++i) ^ user.cpp: In function ‘void next_char()’: user.cpp:17:35: 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, BUFF_SIZE, fin); ^