Compilare: main.cpp: In function 'void dfs(int)': main.cpp:22:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] #define FOR(i,a,b) for (int i = (a); i < (b); ++i) ^ main.cpp:121:2: note: in expansion of macro 'FOR' FOR(i,0,G[x].size()) ^~~ main.cpp: In function 'void solve()': main.cpp:159:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<in.size();i++) ~^~~~~~~~~~ main.cpp:162:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<ans.size();i++) ~^~~~~~~~~~~