Compilare: main.cpp: In member function 'bool BFS::advance()': main.cpp:91:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<graph[node].size(); i++) { ~^~~~~~~~~~~~~~~~~~~ main.cpp: In member function 'void DSU::recolor(int, int)': main.cpp:111:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<graph[x].size(); i++) { ~^~~~~~~~~~~~~~~~ main.cpp: In member function 'char InParser::read_ch()': main.cpp:18:29: 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, SIZE, fin); ^