foo.cc: In function 'int main()':
foo.cc:35:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   35 |     n = read(),scanf("%s",s+1);
      |                ~~~~~^~~~~~~~~~
foo.cc:36:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   36 |     m = read(),scanf("%s",p+1);
      |                ~~~~~^~~~~~~~~~

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