Compilare: user.cpp: In function ‘int main()’: user.cpp:54:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (ciclu.size() != M) ~~~~~~~~~~~~~^~~~ user.cpp:44:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &M); ^ user.cpp:47:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^