View Compilation Error

0_0_39520819_23869.cpp: In function 'void solve()':
0_0_39520819_23869.cpp:13:37: error: 'haed' was not declared in this scope; did you mean 'head'?
   13 |         for(int i = 0; i <= n; ++i) haed[i] = 0;
      |                                     ^~~~
      |                                     head