Compilare: user.cpp: In function ‘bool Verify(int)’: user.cpp:30:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] newStr.erase(0, newStr.size() > len ? 1 : 0); ^ user.cpp:32:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (newStr.size() == len) ^ user.cpp:45:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] return mySet.size() == sizeOfSet; ^ user.cpp: In function ‘int main()’: user.cpp:94:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (++index < sol.size()) ^