Compilare: user.cpp: In function ‘int Stoi(std::string)’: user.cpp:9:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<s.size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:20:15: warning: unused variable ‘j’ [-Wunused-variable] int n,t,i,j,x,nr; ^ user.cpp:20:17: warning: unused variable ‘x’ [-Wunused-variable] int n,t,i,j,x,nr; ^ user.cpp:51:5: warning: ‘nr’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(nr==t) ^