foo.cc: In function 'int main()':
foo.cc:37:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   37 |   scanf("%d %d",&n,&k);
      |   ~~~~~^~~~~~~~~~~~~~~
foo.cc:39:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   39 |     scanf("%d",&a[i]);
      |     ~~~~~^~~~~~~~~~~~

正在同步测试数据，请稍后
Found 10 testcases.
[Hydro](https://hydro.ac)提供评测服务