Compilare: main.cpp: In function 'int main()': main.cpp:86:20: warning: array subscript has type 'char' [-Wchar-subscripts] var[car]=!var[car]; ^ main.cpp:86:30: warning: array subscript has type 'char' [-Wchar-subscripts] var[car]=!var[car]; ^ main.cpp:122:51: warning: array subscript has type 'char' [-Wchar-subscripts] st1[++k1]=var[s[j-1]]; ^ main.cpp:150:58: warning: array subscript has type 'char' [-Wchar-subscripts] while(k2>0&&pr[st2[k2]]>=pr[x]) ^ main.cpp: In function 'int op(int, int)': main.cpp:60:1: warning: control reaches end of non-void function [-Wreturn-type] } ^