foo.cc: In function 'int main()':
foo.cc:13:18: warning: format '%ld' expects argument of type 'long int*', but argument 2 has type 'char*' [-Wformat=]
   13 |         scanf("%ld%s", er_dir+i, er_occ[i]);
      |                ~~^     ~~~~~~~~
      |                  |           |
      |                  long int*   char*
      |                %hhd
foo.cc:11:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   11 |     scanf("%ld%ld", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~~~
foo.cc:13:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   13 |         scanf("%ld%s", er_dir+i, er_occ[i]);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:16:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   16 |         scanf("%ld%ld", &a, &s);        // 获取左右和序数
      |         ~~~~~^~~~~~~~~~~~~~~~~~

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Found 20 testcases.
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