/**
* 最N叉树的最大深度?
* @param {*} val
* @param {*} children
*/
var maxDepth = function(root){
if(root === null) return 0;
let depthLeft = maxDepth(root.left);
let depthRight = maxDepth(root.right);
return Math.max(depthLeft,depthRight)+1;
}
console.log(maxDepth(a));
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