Compilare: user.cpp: In function ‘void Sort()’: user.cpp:51:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int index = 1; index < v.size(); index++) ^ user.cpp: In function ‘void Solve()’: user.cpp:70:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int index = 2; index < v.size(); index++) ^ user.cpp: In function ‘void Print()’: user.cpp:88:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int index = 0; index < stack.size(); index++) ^