Compilare: main.cpp: In function 'int main()': main.cpp:78:14: warning: array subscript has type 'char' [-Wchar-subscripts] 78 | used[x] = used[y] = 1; | ^ main.cpp:78:24: warning: array subscript has type 'char' [-Wchar-subscripts] 78 | used[x] = used[y] = 1; | ^ main.cpp:79:14: warning: array subscript has type 'char' [-Wchar-subscripts] 79 | dout[x]++; din[y]++; | ^ main.cpp:79:24: warning: array subscript has type 'char' [-Wchar-subscripts] 79 | dout[x]++; din[y]++; | ^ main.cpp:80:11: warning: array subscript has type 'char' [-Wchar-subscripts] 80 | L[x].push_back(y); | ^ main.cpp:109:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 109 | while (root < roots.size()) { | ~~~~~^~~~~~~~~~~~~~