Commit c4a733a

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update: height of BST

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	`1`	`+// eslint-disable-next-line no-unused-vars`
	`2`	`+const BST = require('../index');`
	`3`	`+`
	`4`	`+function findHeightOfBST(root) {`
	`5`	`+ let leftHeight = 0;`
	`6`	`+ let rightHeight = 0;`
	`7`	`+`
	`8`	`+ if (root === null) return 0;`
	`9`	`+ leftHeight = findHeightOfBST(root.leftChild);`
	`10`	`+ rightHeight = findHeightOfBST(root.rightChild);`
	`11`	`+`
	`12`	`+ if (leftHeight > rightHeight) {`
	`13`	`+ return leftHeight + 1;`
	`14`	`+ }`
	`15`	`+ return rightHeight + 1;`
	`16`	`+}`
	`17`	`+`
	`18`	`+// create a BST`
	`19`	`+// const myBST = new BST(6);`
	`20`	`+// myBST.add(4);`
	`21`	`+// myBST.add(9);`
	`22`	`+// myBST.add(2);`
	`23`	`+// myBST.add(5);`
	`24`	`+// myBST.add(14);`
	`25`	`+// myBST.add(8);`
	`26`	`+// myBST.add(12);`
	`27`	`+// myBST.add(10);`
	`28`	`+`
	`29`	`+// // find 3rd max`
	`30`	`+// // console.log(myBST.root);`
	`31`	`+// console.log(myBST.traversePreorder());`
	`32`	`+// // console.log(myBST.root.rightChild);`
	`33`	`+// console.log(findHeightOfBST(myBST.root));`
	`34`	`+`
	`35`	`+module.exports = findHeightOfBST;`

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