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Pku3764 The xor-longest Path

Time Limit:?1 Sec??Memory Limit:?64 MB
Submit:?839??Solved:?369
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Description

?給定一棵n個點的帶權樹，求樹上最長的異或和路徑

Input

The input contains several test cases. The first line of each test case contains an integer n(1<=n<=100000), The following n-1 lines each contains three integers u(0 <= u < n),v(0 <= v < n),w(0 <= w < 2^31), which means there is an edge between node u and v of length w.

Output

For each test case output the xor-length of the xor-longest path.

Sample Input

4
1 2 3
2 3 4
2 4 6

Sample Output

7

HINT

The xor-longest path is 1->2->3, which has length 7 (=3 ⊕ 4)?
注意：結點下標從1開始到N....

對于x，y之間的異或和，等于x到根節點的異或和 ^ y到根節點的異或和。

然后把它們丟到trie里，貪心就好。

代碼待補

轉載于:https://www.cnblogs.com/kvrmnks/p/6917317.html

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