Compilare: user.cpp: In function ‘int main()’: user.cpp:38:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d %d " ,&n,&m); ^ user.cpp:68:29: warning: ‘i’ may be used uninitialized in this function [-Wmaybe-uninitialized] fill(j, i, j + 3, m); ^