foo.cc: In function 'int main()':
foo.cc:24:15: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long long int' [-Wformat=]
   24 |    printf("%-4d",a[i][j]);
      |            ~~~^  ~~~~~~~
      |               |        |
      |               int      long long int
      |            %-4lld

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