foo.cc: In function 'int main()':
foo.cc:29:4: error: 'cnt' was not declared in this scope; did you mean 'int'?
   29 |    cnt++;
      |    ^~~
      |    int
foo.cc:32:17: error: 'cnt' was not declared in this scope; did you mean 'int'?
   32 |  printf("%d\n", cnt );
      |                 ^~~
      |                 int
foo.cc:16:6: warning: unused variable 'flog' [-Wunused-variable]
   16 |  int flog = 0;
      |      ^~~~
foo.cc:6:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    6 |  scanf("%d%d", &n,&m );
      |  ~~~~~^~~~~~~~~~~~~~~~
foo.cc:11:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   11 |    scanf("%d", &arr[i][j]);
      |    ~~~~~^~~~~~~~~~~~~~~~~~

[Hydro](https://hydro.ac)提供评测服务