Compilare: user.cpp: In function ‘int main()’: user.cpp:159:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < ans.size() - 1; ++i) ^ user.cpp: In function ‘int lee(int, int)’: user.cpp:96:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:158:17: warning: ‘lastn’ may be used uninitialized in this function [-Wmaybe-uninitialized] euler(lastn); ^