foo.c: In function 'bigchengfa':
foo.c:8:24: warning: argument to 'sizeof' in 'memset' call is the same expression as the destination; did you mean to dereference it? [-Wsizeof-pointer-memaccess]
    8 |     memset(sum,0,sizeof(sum));
      |                        ^
foo.c: In function 'main':
foo.c:28:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   28 |     scanf("%s %s",sa,sb);
      |     ^~~~~~~~~~~~~~~~~~~~

[Hydro](https://hydro.ac)提供评测服务