Compilare: user.cpp: In function ‘int main()’: user.cpp:28:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1 ; i < a.size() ; ++i) ^ user.cpp:32:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (cR < a.size() && a[cR] == a[cR - i]) cR += 1; ^ user.cpp:42:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (cR < a.size() && a[cR] == a[cR - i]) cR += 1; ^ user.cpp:54:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1 ; i < a.size() ; ++i) ^ user.cpp:58:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (cR < a.size() && a[cR] == a[cR - i]) cR += 1; ^ user.cpp:68:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (cR < a.size() && a[cR] == a[cR - i]) cR += 1; ^ user.cpp:74:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = y.size();i <= a.size() - y.size();++i) ^ user.cpp:80:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1;i <= y.size() >> 1; ++i) ^