foo.cc: In function 'int main()':
foo.cc:19:18: error: 'maxnum' was not declared in this scope
   19 |         if(sum > maxnum)
      |                  ^~~~~~
foo.cc:20:27: error: 'maxlayer' was not declared in this scope
   20 |             maxnum = sum, maxlayer = layer + 1;
      |                           ^~~~~~~~
foo.cc:20:38: error: 'layer' was not declared in this scope
   20 |             maxnum = sum, maxlayer = layer + 1;
      |                                      ^~~~~
foo.cc:23:13: error: 'maxlayer' was not declared in this scope
   23 |     cout << maxlayer;
      |             ^~~~~~~~
foo.cc:6:18: warning: unused variable 'mp' [-Wunused-variable]
    6 |     long long n, mp, cnt = 0, flag = 0;
      |                  ^~

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