Compilare: user.cpp: In function ‘int main()’: user.cpp:22:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < top; i++) ^ user.cpp:27:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < n; i++) ^ user.cpp:32:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < n - 1; i++) ^ user.cpp:34:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = i + 2; j < n; j++) ^