foo.c: In function 'main':
foo.c:13:6: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   13 |   if(m=0)
      |      ^
foo.c:17:5: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   17 |  if(n=0)
      |     ^
foo.c:6:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
    6 |  scanf("%d",&x);
      |  ^~~~~~~~~~~~~~

[Hydro](https://hydro.ac)提供评测服务