foo.cc: In function 'int main()':
foo.cc:10:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   10 |     scanf("%d%d%d", &n, &m, &k); //读入
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~
foo.cc:12:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   12 |         scanf("%d%d", &a, &b); //读入坐标
      |         ~~~~~^~~~~~~~~~~~~~~~

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