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Merge pull request youngyangyang04#1667 from Tcotyledons/master

Update 0104.二叉树的最大深度.md

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`@@ -313,6 +313,31 @@ class solution {`
`313`	`313`	`}`
`314`	`314`	```
`315`	`315`
	`316`	+```java
	`317`	`+class Solution {`
	`318`	`+ /**`
	`319`	`+ * 递归法(求深度法)`
	`320`	`+ */`
	`321`	`+ //定义最大深度`
	`322`	`+ int maxnum = 0;`
	`323`	`+`
	`324`	`+ public int maxDepth(TreeNode root) {`
	`325`	`+ ans(root,0);`
	`326`	`+ return maxnum;`
	`327`	`+ }`
	`328`	`+`
	`329`	`+ //递归求解最大深度`
	`330`	`+ void ans(TreeNode tr,int tmp){`
	`331`	`+ if(tr==null) return;`
	`332`	`+ tmp++;`
	`333`	`+ maxnum = maxnum<tmp?tmp:maxnum;`
	`334`	`+ ans(tr.left,tmp);`
	`335`	`+ ans(tr.right,tmp);`
	`336`	`+ tmp--;`
	`337`	`+ }`
	`338`	`+}`
	`339`	+```
	`340`	`+`
`316`	`341`	```java
`317`	`342`	`class solution {`
`318`	`343`	`/**`

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