foo.cc: In function 'int main()':
foo.cc:10:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     int n,k; scanf("%d%d", &n, &k);
              ~~~~~^~~~~~~~~~~~~~~~
foo.cc:12:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         for(int j=1;j<=n;j++) scanf("%d", &num[i][j]);
                               ~~~~~^~~~~~~~~~~~~~~~~~

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