View Compilation Error

0_0_39321884_5685.cpp: In function 'int main()':
0_0_39321884_5685.cpp:133:26: error: 'head' was not declared in this scope
  133 |         ListNode* curr = head;
      |                          ^~~~
0_0_39321884_5685.cpp:149:14: error: expected '}' at end of input
  149 |     return 0;
      |              ^
0_0_39321884_5685.cpp:124:11: note: to match this '{'
  124 | int main(){
      |           ^