Compilare: user.c: In function ‘main’: user.c:38:18: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(r1&&r2||r1==0&&r2==0) ^ user.c:14:13: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf (f,"%d",&n); ^ user.c:15:13: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf (f,"%d",&m); ^ user.c:19:15: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&a[i][j]); ^