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Merge pull request knaxus#123 from abuasifkhan/abuasifkhan_adding_check-binary-tree-subtree-another-binary-tree

Adding Check if a binary tree is subtree of another binary tree

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src/_DataStructures_/Trees/BinaryTree/check-binary-tree-subtree-another-binary-tree
- index.js

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`‎src/_DataStructures_/Trees/BinaryTree/check-binary-tree-subtree-another-binary-tree/index.js‎`

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	`1`	`+// Check if a binary tree is subtree of another binary tree`
	`2`	`+// Root of the source tree and the tree to be matched are provided in the parameters.`
	`3`	`+// Return true/false based on whether or not the given tree is the subtree of the source tree`
	`4`	`+// Time complexity : O(m*n) m is the number of nodes of the original tree,`
	`5`	`+// n is the number of nodes in the tree to be matched`
	`6`	`+`
	`7`	`+function areIdentical(rootOfOriginalTree, rootOfMatchingTree) {`
	`8`	`+ if (rootOfOriginalTree === null && rootOfMatchingTree === null) {`
	`9`	`+ return true;`
	`10`	`+ }`
	`11`	`+`
	`12`	`+ if (rootOfOriginalTree === null \|\| rootOfMatchingTree === null) {`
	`13`	`+ return false;`
	`14`	`+ }`
	`15`	`+`
	`16`	`+ return (rootOfOriginalTree.value === rootOfMatchingTree.value) && areIdentical(rootOfOriginalTree.leftChild, rootOfMatchingTree.leftChild) && areIdentical(rootOfOriginalTree.rightChild, rootOfMatchingTree.rightChild);`
	`17`	`+}`
	`18`	`+`
	`19`	`+function isSubtree(rootOfOriginalTree, rootOfMatchingTree) {`
	`20`	`+ if (rootOfMatchingTree === null) {`
	`21`	`+ return true;`
	`22`	`+ }`
	`23`	`+`
	`24`	`+ if (rootOfOriginalTree === null) {`
	`25`	`+ return false;`
	`26`	`+ }`
	`27`	`+`
	`28`	`+ if (areIdentical(rootOfOriginalTree, rootOfMatchingTree)) {`
	`29`	`+ return true;`
	`30`	`+ }`
	`31`	`+`
	`32`	`+ return isSubtree(rootOfOriginalTree.leftChild, rootOfMatchingTree) \|\| isSubtree(rootOfMatchingTree.rightChild, rootOfMatchingTree);`
	`33`	`+}`
	`34`	`+`
	`35`	`+module.exports = {`
	`36`	`+ isSubtree,`
	`37`	`+};`

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`‎src/_DataStructures_/Trees/BinaryTree/check-binary-tree-subtree-another-binary-tree/index.js‎`

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