Compilare: user.cpp: In function ‘long long int dfs(long long int)’: user.cpp:32:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:63:12: warning: array subscript has type ‘char’ [-Wchar-subscripts] L[x].push_back (y); ^ user.cpp:64:12: warning: array subscript has type ‘char’ [-Wchar-subscripts] u[y]++; ^ user.cpp:77:13: warning: array subscript has type ‘char’ [-Wchar-subscripts] X[ch] = ch; ^