Compilare: user.cpp: In function ‘void shunting_yard(const string&, std::string&, std::vector<bool>&)’: user.cpp:40:36: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(!op.empty()&&prec[from[fc]]<=prec[op.top()]){ ^ user.cpp:40:36: warning: pointer to a function used in arithmetic [-Wpointer-arith] user.cpp:40:52: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(!op.empty()&&prec[from[fc]]<=prec[op.top()]){ ^ user.cpp:40:52: warning: pointer to a function used in arithmetic [-Wpointer-arith] user.cpp: In function ‘bool eval(const string&)’: user.cpp:74:19: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] num.top() = x&&!num.top() || !x&&num.top(); ^ user.cpp:83:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:117:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<(1<<nr);++i){ ^ user.cpp:119:37: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] if(eval(rp1)!=eval(rp2)) i=1<<nr+1; ^ user.cpp:121:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i==(1<<nr)) fout<<"egale\n"; ^