Compilare: main.cpp: In function 'void dfs(int)': main.cpp:29:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<l[nod].size();i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'void drum(int, int)': main.cpp:56:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<l[nod].size();i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:81:13: warning: array subscript has type 'char' [-Wchar-subscripts] l[c1].push_back(c2); ^ main.cpp:82:13: warning: array subscript has type 'char' [-Wchar-subscripts] g[c2]++; ^