1325. Delete Leaves With a Given Value.cpp

/**
 * Definition for a binary tree node.
 * struct TreeNode {
 *     int val;
 *     TreeNode *left;
 *     TreeNode *right;
 *     TreeNode() : val(0), left(nullptr), right(nullptr) {}
 *     TreeNode(int x) : val(x), left(nullptr), right(nullptr) {}
 *     TreeNode(int x, TreeNode *left, TreeNode *right) : val(x), left(left), right(right) {}
 * };
 */
class Solution {
public:
    
    TreeNode* removeLeafNodes(TreeNode* root, int target){
        if(root == NULL) return nullptr;
        
        root->left = removeLeafNodes(root->left, target);
        root->right = removeLeafNodes(root->right,target);
        if(root->left == NULL && root->right ==NULL && root->val==target) return nullptr;
        else return root;
        
    }
    
};