Created
September 5, 2014 20:25
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BSTValidity
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| public Boolean isValidBinary(BinaryTreeNode root, BinaryTreeNode prev){ | |
| // Stack 3 2 1 | |
| // 1 2 3 | |
| // if(current.left != null ){ | |
| // Boolean left = isValidBinary(current.left); | |
| // if(left == false) | |
| // return false; | |
| // else{ | |
| // if(root.right.item > root.item){ | |
| // return isValidBinary(root.right); | |
| // }else if(root. | |
| // } | |
| // } | |
| /** | |
| * I thought of storing the previous value of the node | |
| **/ | |
| if(root == null) | |
| return true; | |
| else if(root.left == null && root.right==null) | |
| return true; | |
| else if(!isValidBinary(root.left, prev)) | |
| return false; | |
| else if(prev != null && (int)root.item <= (int)prev.item) | |
| return false; | |
| prev = root; | |
| return isValidBinary(root.right, prev); | |
| // 4 | |
| } |
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