Eroare de compilare: user.cpp: In function ‘long int stoi(std::string)’: user.cpp:8:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s.size(); i++) { ^ user.cpp: In function ‘long int eval(std::string)’: user.cpp:16:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s.size(); i++) { ^ user.cpp:29:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < s.size(); i++) { ^ user.cpp:45:18: error: call of overloaded ‘stoi(std::string&)’ is ambiguous return stoi(s); ^ user.cpp:45:18: note: candidates are: user.cpp:6:6: note: long int stoi(std::string) long stoi(string s) { ^ In file included from /usr/include/c++/4.8/string:52:0, from /usr/include/c++/4.8/bits/locale_classes.h:40, from /usr/include/c++/4.8/bits/ios_base.h:41, from /usr/include/c++/4.8/ios:42, from /usr/include/c++/4.8/ostream:38, from /usr/include/c++/4.8/iostream:39, from user.cpp:1: /usr/include/c++/4.8/bits/basic_string.h:2823:3: note: int std::stoi(const string&, std::size_t*, int) stoi(const string& __str, size_t* __idx = 0, int __base = 10) ^ user.cpp:46:1: warning: control reaches end of non-void function [-Wreturn-type] } ^