Compilare: user.cpp: In function ‘int main()’: user.cpp:14:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &k); ^ user.cpp:23:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &p[i]); ^ user.cpp:17:15: warning: iteration 50001u invokes undefined behavior [-Waggressive-loop-optimizations] f[i] = 0; ^ user.cpp:16:5: note: containing loop for (int i = 0; i <= 2 * MAX_SPAN; i++) { ^