Find Largest Value in Each Tree Row @LeetCode

PROBLEM :

You need to find the largest value in each row of a binary tree.

Example:
Input:

          1
         / \
        3   2
       / \   \
      5   3   9

Output: [1, 3, 9]

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SIMPLE c++ IMPLEMENTATION :
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/**
 * Definition for a binary tree node.
 * struct TreeNode {
 *     int val;
 *     TreeNode *left;
 *     TreeNode *right;
 *     TreeNode(int x) : val(x), left(NULL), right(NULL) {}
 * };
 */

class Solution {
public:
    vector<int> largestValues(TreeNode* root) {
       
        vector<int> vec ;
        if(!root)
            return vec ;
           
        queue<TreeNode*> que ;
        que.push(root) ;
       
        while(!que.empty())
        {
            int size=que.size() ;
            int max=INT_MIN ;
            while(size--)
            {
                TreeNode* curr=que.front() ;
                que.pop() ;
               
                if(curr->val>max)
                    max=curr->val ;
                   
                if(curr->left)
                    que.push(curr->left) ;
                   
                if(curr->right)
                    que.push(curr->right) ;
            }
            vec.push_back(max) ;
        }
        return vec ;
    }
};

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