Compilare: user.cpp: In function ‘int main()’: user.cpp:72:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (sol.size() == N + 1){ ^ user.cpp:75:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < sol.size() - 1; i ++){ ^ user.cpp:49:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &N); ^ user.cpp:53:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^