Compilare: user.cpp: In function ‘int main()’: user.cpp:45:51: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(k=ts;k&&sts[k]!='('&&gp[sts[k]]>=gp[s[i]];--k) ^ user.cpp:45:61: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(k=ts;k&&sts[k]!='('&&gp[sts[k]]>=gp[s[i]];--k) ^