HDU3038 How Many Answers Are Wrong 解题报告【带权并查集】

这是一个关于并查集算法的应用问题,描述了TT和FF之间的游戏,FF需要从TT给出的一串整数序列中找出连续子序列的和。由于TT有时会故意给出错误答案,FF需要确定有多少答案是错误的。题目要求通过程序判断错误答案的数量,确保最终能恢复整个序列。解决方案是使用带权并查集,每当遇到新的区间和,就合并区间两端并验证权值之差是否匹配,从而计算错误答案的个数。

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Problem Description
TT and FF are … friends. Uh… very very good friends -__-b
FF is a bad boy, he is always wooing TT to play the following game with him. This is a very humdrum game. To begin with, TT should write down a sequence of integers-_-!!(bored).

Then, FF can choose a continuous subsequence from it(for example the subsequence from the third to the fifth integer inclusively). After that, FF will ask TT what the sum of the subsequence he chose is. The next, TT will answer FF’s question. Then, FF can redo this process. In the end, FF must work out the entire sequence of integers.
Boring~~Boring~~a very very boring game!!! TT doesn’t want to play with FF at all. To punish FF, she often tells FF

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