foo.cc: In function 'int main()':
foo.cc:23:2: error: expected ';' before '}' token
  }
  ^
foo.cc:25:16: error: expected primary-expression before ';' token
  for(int i=1;i<;i++)
                ^
foo.cc:27:9: error: 'j' was not declared in this scope
   dfs(i,j);
         ^
foo.cc:27:3: error: 'dfs' was not declared in this scope
   dfs(i,j);
   ^~~
foo.cc:24:6: warning: unused variable 'k' [-Wunused-variable]
  int k=0;
      ^
foo.cc:18:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
  ~~~~~^~~~~~~~~
foo.cc:22:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%c",&a[i][j])
   ~~~~~^~~~~~~~~~~~~~~

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