Compilare: main.cpp: In function 'void dfs(int)': main.cpp:75:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v[ nod ].size(); ++i) ~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:126:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < answ.size(); ++i) ~~^~~~~~~~~~~~~ main.cpp: In member function 'char InParser::read_ch()': main.cpp:16:29: 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, 4096, fin); ^