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algorithm/Week_01/id_108/LeetCode_687_108.java at master · feixiangcode/algorithm · GitHub
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Week_01
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id_108
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LeetCode_687_108.java
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algorithm
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Week_01
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id_108
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LeetCode_687_108.java
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/**
* @author zhangruihao.zhang
* @version v1.0.0
* @since 2019/05/03
*/
public
class
LeetCode_687_108
{
/**
* Definition for a binary tree node.
* public class TreeNode {
* int val;
* TreeNode left;
* TreeNode right;
* TreeNode(int x) { val = x; }
* }
*/
class
Solution
{
int
maxLen
=
0
;
public
int
longestUnivaluePath
(
TreeNode
root
) {
if
(
root
==
null
){
return
0
;
}
longest
(
root
);
return
maxLen
;
}
private
int
longest
(
TreeNode
root
){
if
(
root
==
null
){
return
0
;
}
int
leftLen
=
longest
(
root
.
left
);
int
rightLen
=
longest
(
root
.
right
);
int
leftUnivalueLen
=
0
;
int
rightUnivalue
=
0
;
if
(
root
.
left
!=
null
&&
root
.
left
.
val
==
root
.
val
){
leftUnivalueLen
=
leftLen
+
1
;
}
if
(
root
.
right
!=
null
&&
root
.
right
.
val
==
root
.
val
){
rightUnivalue
=
rightLen
+
1
;
}
maxLen
=
max
(
maxLen
,
leftUnivalueLen
+
rightUnivalue
);
return
max
(
leftUnivalueLen
,
rightUnivalue
);
}
private
int
max
(
int
x
,
int
y
){
return
x
>
y
?
x
:
y
;
}
}
}
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