Compilare: user.cpp: In function ‘int main()’: user.cpp:24:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(!dq[first].empty() && i - dq[first].front() > k) ^ user.cpp:24:50: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(!dq[first].empty() && i - dq[first].front() > k) ^ user.cpp:25:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] dq[first].pop_front(); ^ user.cpp:27:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(!dq[first].empty()) ^ user.cpp:28:34: warning: array subscript has type ‘char’ [-Wchar-subscripts] ans[i] = ans[dq[first].front()] + 1; ^ user.cpp:32:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(!dq[last].empty() && ans[dq[last].back()] <= ans[i]) ^ user.cpp:32:47: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(!dq[last].empty() && ans[dq[last].back()] <= ans[i]) ^ user.cpp:33:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] dq[last].pop_back(); ^ user.cpp:35:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] dq[last].push_back(i); ^