Implemented Level Order Traversal of a binary tree

Trees Algorithm/binary-tree-level-order-traversal

@@ -0,0 +1,24 @@
+class Solution {
+public:
+    vector<vector<int>> levelOrder(TreeNode* root) {
+        vector<vector<int>> answer;
+        if(!root) return answer;  //if root is NULL then return
+        queue<TreeNode*> q;  //for storing nodes
+        q.push(root);  //push root initially to the queue
+        while(!q.empty())  //while queue is not empty go and follow few steps
+        {
+            int size=q.size();  //storing queue size for while loop
+            vector<int> v;  //for storing nodes at the same level
+            while(size--)  
+            {
+                TreeNode* temp=q.front();  //store front node of queue  and pop it from queue
+                q.pop();
+                v.push_back(temp->val);  //push it to v
+                if(temp->left) q.push(temp->left);  //if left subtree exist for temp then store it into the queue
+                if(temp->right) q.push(temp->right);  //if right subtree exist for temp then store it into the queue
+            }
+            answer.push_back(v);  //push v into answer, as v consist of all the nodes of current level
+        }
+        return answer;  //return the answer
+    }
+};