c++: almost same input but 2nd call shows segment fault -

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I've been a C # developer for a long time and try to refresh my previous C ++ knowledge I do not know That is why the "root" address of the second ISLN (Route) call becomes 0x0, of course, this question will be very clear for most C ++ developers. Please, give me some pointers.

Result: 1. What is balanced? 0 partition fault: 11 

  #include & lt; Iostream & gt; using namespace std; Structure node {node * left; Node * true; }; Int Gatehite (node ​​* node) {if (node ​​== faucet) returns 0; If (node-> left == faucet & node-> true == faucet) returns 1; Int leftHeight = GetHeight (node-> left); Int rightHeight = GetHeight (node-> right); If left (left> gt; right right) 1 + left return; And 1+ correct return; } Bool isbalanced (node ​​and node) {int leftHight = 0; Int rightHeight = 0; If (node.left == NULL & amp; amp; node.right == NULL) return true; If (node.left! = NULL) leftHeight = GetHeight (node. Left); If (node.right! = NULL) rightHeight = GetHeight (node. Right); Int diff = leftHeight - rightHeight; If (diff> = -1 & amp; amp; amp;; diff & lt; = 1) {if (IsBalanced (* node.left) & IsBalanced (* node. Wright)) True; Second false return; } And false return; } int main () {node root, N1, N2, N3, N4, N5; Root.left = & amp; n1; Root.right = NULL; N1.left = & amp; N2; N1 Right = & amp; N3; N2.left = NULL; N2.right = NULL; N3.left = & amp; n4; N3.right = NULL; N4 Right = & amp; N5; N4.left = NULL; N5.right = NULL; N5.left = NULL; The court's & lt; & Lt; "1. Is it balanced?" & Lt; & Lt; Isalant (Route) & lt; & Lt; Endl; Root.left = & amp; n1; Root.right = & amp; n2; N1.left = & amp; n3; N1 Right = & amp; N4; N2.left = & amp; n5; N2.right = NULL; N3.left = NULL; N3.right = NULL; N4.right = NULL; N4.left = NULL; N5.right = NULL; N5.left = NULL; The court's & lt; & Lt; "2. Is it balanced?" & Lt; & Lt; Isalant (Route) & lt; & Lt; Endl; Return 0; }   
 
 
 This row is the culprit.  
  if (IsBalanced (* node.left)) and amp; IsBalanced (* node.right))   
 You are not checking whether the  node.left  or  node. Right  tap before being removed. The first walk works due to the lucky coincidence.  
 This is an updated version of IsBalanced  that works for me:  
  bool isbalanced (node ​​& node) {int leftHeight = 0; Int rightHeight = 0; If (node.left == NULL & amp; amp; node.right == NULL) return true; If (node.left! = NULL) leftHeight = GetHeight (node. Left); If (node.right! = NULL) rightHeight = GetHeight (node. Right); Int diff = leftHeight - rightHeight; If (diff> = -1 & amp; amp; and diff & lt; = 1) {if (node.left == NULL || node .right == NULL} {back true; } And {return (Islawand (* node left) and IsBalanced (* node. Right); }} And return false; }

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