Compilare: user.cpp: In function ‘int main()’: user.cpp:14:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] while (!Q[a].empty() && i - Q[a].front() > k) ^ user.cpp:14:40: warning: array subscript has type ‘char’ [-Wchar-subscripts] while (!Q[a].empty() && i - Q[a].front() > k) ^ user.cpp:15:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] Q[a].pop_front(); ^ user.cpp:16:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (!Q[a].empty()) mx[i] = mx[Q[a].front()] + 1; ^ user.cpp:16:42: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (!Q[a].empty()) mx[i] = mx[Q[a].front()] + 1; ^ user.cpp:18:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] while (!Q[b].empty() && mx[Q[b].back()] <= mx[i]) ^ user.cpp:18:39: warning: array subscript has type ‘char’ [-Wchar-subscripts] while (!Q[b].empty() && mx[Q[b].back()] <= mx[i]) ^ user.cpp:19:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] Q[b].pop_back(); ^ user.cpp:20:12: warning: array subscript has type ‘char’ [-Wchar-subscripts] Q[b].push_back(i); ^