foo.cc: In function 'int main()':
foo.cc:11:59: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   11 |  cin>>m>>n;for(int i=1;i<=m;i++)for(int j=1;j<=n;j++)scanf("%d",&a[i][j]);
      |                                                      ~~~~~^~~~~~~~~~~~~~~

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