foo.cc: In function 'int main()':
foo.cc:9:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    9 |  scanf("%d %d",&abcd1,&abcd2);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~
foo.cc:8:32: warning: 'count' may be used uninitialized in this function [-Wmaybe-uninitialized]
    8 |  int abcd1,abcd2,ab,cd,i,a[10],count;
      |                                ^~~~~

[Hydro](https://hydro.ac)提供评测服务