Compilare: user.cpp: In function ‘int analiza(std::string)’: user.cpp:44:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<x.size();i++) ^ user.cpp:68:50: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(!op.empty()&&p[op.top()]>p[x[i]]) ^ user.cpp:68:58: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(!op.empty()&&p[op.top()]>p[x[i]]) ^ user.cpp:81:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘void back(int, int, int&)’: user.cpp:85:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j; ^ user.cpp: In function ‘int ap(std::string, std::string)’: user.cpp:113:14: warning: array subscript has type ‘char’ [-Wchar-subscripts] apa[j]=apb[j]=0; ^ user.cpp:113:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] apa[j]=apb[j]=0; ^ user.cpp:115:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<a1.size();i++) ^ user.cpp:117:37: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(isalpha(a1[i])) apa[a1[i]]=1; ^ user.cpp:119:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<b1.size();i++) ^ user.cpp:121:37: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(isalpha(b1[i])) apb[b1[i]]=1; ^ user.cpp:125:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(apa[j]==apb[j]) ^ user.cpp:125:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(apa[j]==apb[j]) ^ user.cpp:127:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(apa[j]==1) c.push_back(j); ^ user.cpp: In function ‘int main()’: user.cpp:138:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,d,r=1; ^