Compilare: main.cpp: In function 'void Dfs(int)': main.cpp:60:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<graph[node].size(); ++i) ~^~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void Write()': main.cpp:113:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<ind[node].size(); ++i) ~^~~~~~~~~~~~~~~~~ main.cpp: In function 'char nextch()': main.cpp:16:35: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buf, BUF_SIZE, 1, f); ^