foo.cc: In function 'int main()':
foo.cc:70:16: error: expected primary-expression before ';' token
   70 |  cout << ans <<;
      |                ^
foo.cc:26:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   26 |    scanf("%d", &num[i][j]);
      |    ~~~~~^~~~~~~~~~~~~~~~~~

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