foo.cc: In function 'int main()':
foo.cc:26:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   26 |     scanf("%4d%2d%2d", &y1, &m1, &d1);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:30:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   30 |     scanf("%4d%2d%2d", &y2, &m2, &d2);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

正在同步测试数据，请稍后
Found 5 testcases.
[Hydro](https://hydro.ac)提供评测服务