foo.cc: In function 'void work()':
foo.cc:88:22: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare]
   88 |         for(i = 0; i < strlen(q1[h1].str); i++) {
      |                    ~~^~~~~~~~~~~~~~~~~~~~
foo.cc:97:22: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare]
   97 |         for(i = 0; i < strlen(q2[h2].str); i++) {      //加快搜索的速度，同理从目标开始，方向，并根据逆向规则进行BFS
      |                    ~~^~~~~~~~~~~~~~~~~~~~
foo.cc: In function 'int main()':
foo.cc:110:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  110 |     scanf("%s%s", q1[0].str, q2[0].str);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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