Compilare: user.cpp: In function ‘void Back(int, int)’: user.cpp:62:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = N[k - 1] + 1; i < V.size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:76:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < V.size(); i++) ^ user.cpp:83:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < S.size(); i++) ^