Compilare: user.cpp: In function ‘int main()’: user.cpp:40:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d", &n); ^ user.cpp:44:41: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d", &a[i][j]); ^ user.cpp:69:28: warning: ‘col_fin’ may be used uninitialized in this function [-Wmaybe-uninitialized] drum (lin_fin, col_fin); ^ user.cpp:69:28: warning: ‘lin_fin’ may be used uninitialized in this function [-Wmaybe-uninitialized]