Compilare: user.cpp: In function ‘int main()’: user.cpp:19:30: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(i=1;i<=n;++i) fr[s[i]]++; ^ user.cpp:24:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(!fr[loc]) loc++; ^ user.cpp:28:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] lit=fr[loc]; ^ user.cpp:30:38: warning: array subscript has type ‘char’ [-Wchar-subscripts] else if(x==sol_l) lit+=fr[loc]; ^ user.cpp:31:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] cost[loc]=x; ^ user.cpp:35:35: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[i]=make_pair(i-cost[s[i]],i+cost[s[i]]); ^ user.cpp:35:48: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[i]=make_pair(i-cost[s[i]],i+cost[s[i]]); ^