题解 | #牛群的最大高度#

/**
 * struct TreeNode {
 *	int val;
 *	struct TreeNode *left;
 *	struct TreeNode *right;
 * };
 */
/**
 * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
 *
 * 
 * @param root TreeNode类 
 * @return int整型
 */

//先序遍历
void preOreder(struct TreeNode* R,int* max)
{
        if(R ==NULL)
        return;

        if(R->val > *max)
        *max = R->val;
        preOreder(R->left, max);
        preOreder(R->right, max);
}

int findMaxHeight(struct TreeNode* root ) {
    int max = 0;
    struct TreeNode* R = root;
    preOreder(R, &max);
    return max;
}