Difference between revisions of "Training 2: Probability and Expectation"
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Solved by Kilo_5723 && Weaver_zhu. | Solved by Kilo_5723 && Weaver_zhu. | ||
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| + | 题意：给定一个无向联通图，每一条边有一个权值，从起点开始每次随机选一条边走，问走到终点时，走过的所有边权值异或和的期望值。 | ||
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| + | 题解：对于边权的每一个二进制位分别求解，将每个点到终点路径异或和的期望值设为未知数，对每一个点及其所有出边列出方程，高斯消元求解即可。 | ||
== Problem B == | == Problem B == | ||
Revision as of 14:43, 8 May 2019
Problem A
Solved by Kilo_5723 && Weaver_zhu.
题意：给定一个无向联通图，每一条边有一个权值，从起点开始每次随机选一条边走，问走到终点时，走过的所有边权值异或和的期望值。
题解：对于边权的每一个二进制位分别求解，将每个点到终点路径异或和的期望值设为未知数，对每一个点及其所有出边列出方程，高斯消元求解即可。
Problem B
Solved by Kilo_5723 && Weaver_zhu.
Problem C
Solved by Kilo_5723.
Problem D
Solved by Kilo_5723.
Problem E
Solved by Kilo_5723.
Problem F
Solved by Kilo_5723.
Problem G
Solved by Kilo_5723.
Problem H
Solved by Kilo_5723.