Compilare: user.cpp: In function ‘int main()’: user.cpp:98:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d", &n); ^ user.cpp:100:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d", &v[i]); ^ user.cpp:94:15: warning: iteration 3999u invokes undefined behavior [-Waggressive-loop-optimizations] if (ciur[d] == 0) { ^ user.cpp:93:3: note: containing loop for (d = 2; d <= MAXN; d++) ^