View Compilation Error

0_0_21567560_24757.cpp:5:2: error: 'intv' does not name a type
  intv,w;  
  ^
0_0_21567560_24757.cpp:13:10: error: variable or field 'dfs' declared void
 void dfs(intu,int pre){  ///递归找到每一个节点的子节点的个数
          ^
0_0_21567560_24757.cpp:13:10: error: 'intu' was not declared in this scope
0_0_21567560_24757.cpp:13:15: error: expected primary-expression before 'int'
 void dfs(intu,int pre){  ///递归找到每一个节点的子节点的个数
               ^