Compilare: main.cpp: In function 'int main()': main.cpp:14:32: warning: array subscript has type 'char' [-Wchar-subscripts] if(s[i]=='(') s[st[top]]=s[i]; ^ main.cpp:17:25: warning: array subscript has type 'char' [-Wchar-subscripts] if(s[st[top]]=='(') ^ main.cpp:26:20: warning: array subscript has type 'char' [-Wchar-subscripts] s[st[++top]]=s[i]; ^ main.cpp:10:12: warning: unused variable 'j' [-Wunused-variable] int i, j, cntf=0; ^