Compilare: main.cpp: In function 'int main()': main.cpp:95:23: warning: array subscript has type 'char' [-Wchar-subscripts] 95 | else if(pr[s[i]]!=0) | ~~~^ main.cpp:98:50: warning: array subscript has type 'char' [-Wchar-subscripts] 98 | while(op.empty()==false && pr[s[i]]<=pr[op.back()]) | ~~~^ main.cpp:98:64: warning: array subscript has type 'char' [-Wchar-subscripts] 98 | while(op.empty()==false && pr[s[i]]<=pr[op.back()]) | ~~~~~~~^~ main.cpp:101:50: warning: array subscript has type 'char' [-Wchar-subscripts] 101 | while(op.empty()==false && pr[s[i]]<pr[op.back()]) | ~~~^ main.cpp:101:63: warning: array subscript has type 'char' [-Wchar-subscripts] 101 | while(op.empty()==false && pr[s[i]]<pr[op.back()]) | ~~~~~~~^~