Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:92:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<G[nod].size(); i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'int solve()': main.cpp:168:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<G[nod].size(); j++) ~^~~~~~~~~~~~~~ main.cpp:177:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<G[nod].size(); j++) ~^~~~~~~~~~~~~~ main.cpp: In member function 'char InParser::read_ch()': main.cpp:15:29: 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); ^