题解 | #牛群的相似结构#

function isSameTree( p ,  q ) {
    // write code here
    if(p == null && q == null) return true
    if(p == null || q == null) return false
    if(p.val == q.val) return isSameTree(p.left,q.left) && isSameTree(p.right,q.right)
    return false
}