Compilare: user.cpp: In function ‘int main()’: user.cpp:35:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] ++nr[s1[i]]; ^ user.cpp:36:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] --nr[s2[i]]; ^ user.cpp:37:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] q[s1[i]].push(i); ^ user.cpp:49:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] x=q[s2[i]].front(); ^ user.cpp:50:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] q[s2[i]].pop(); ^