Compilare: main.cpp: In function 'int main()': main.cpp:27:20: warning: array subscript has type 'char' [-Wchar-subscripts] while (!Q[a].empty() && i - Q[a].front() > k) ^ main.cpp:27:40: warning: array subscript has type 'char' [-Wchar-subscripts] while (!Q[a].empty() && i - Q[a].front() > k) ^ main.cpp:29:16: warning: array subscript has type 'char' [-Wchar-subscripts] Q[a].pop_front(); ^ main.cpp:31:17: warning: array subscript has type 'char' [-Wchar-subscripts] if (!Q[a].empty()) mx[i] = mx[Q[a].front()] + 1; ^ main.cpp:31:42: warning: array subscript has type 'char' [-Wchar-subscripts] if (!Q[a].empty()) mx[i] = mx[Q[a].front()] + 1; ^ main.cpp:35:20: warning: array subscript has type 'char' [-Wchar-subscripts] while (!Q[b].empty() && mx[Q[b].back()] <= mx[i]) ^ main.cpp:35:39: warning: array subscript has type 'char' [-Wchar-subscripts] while (!Q[b].empty() && mx[Q[b].back()] <= mx[i]) ^ main.cpp:37:16: warning: array subscript has type 'char' [-Wchar-subscripts] Q[b].pop_back(); ^ main.cpp:39:12: warning: array subscript has type 'char' [-Wchar-subscripts] Q[b].push_back(i); ^