Compilare: user.cpp: In function ‘int main()’: user.cpp:51:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d%d", &c, &n); ^ user.cpp:53:39: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%lld%lld", &p1, &p2); ^ user.cpp:56:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%lld", &a[i]); ^ user.cpp: In function ‘long long int element(long long int)’: user.cpp:41:10: warning: ‘sol’ may be used uninitialized in this function [-Wmaybe-uninitialized] return sol; ^~~