foo.cc: In function 'void stepCal()':
foo.cc:84:23: warning: format '%d' expects argument of type 'int', but argument 2 has type 'numSer' {aka 'long long int'} [-Wformat=]
   84 |    printf("第二行 %d\n", g[N]);
      |                      ~^     ~~~~
      |                       |        |
      |                       int      numSer {aka long long int}
      |                      %lld
foo.cc: In function 'void init()':
foo.cc:23:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   23 |    scanf("%d", &N);
      |    ~~~~~^~~~~~~~~~
foo.cc:26:12: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   26 |       scanf("%d", &a[i]);
      |       ~~~~~^~~~~~~~~~~~~

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