Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:30:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<g[nod].size();i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'int query(int, int, int)': main.cpp:62:1: warning: control reaches end of non-void function [-Wreturn-type] } ^