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看到297MS AC时感动得热内盈眶了...1987按边分治的代码TLE...然后改按点分治...还是TLE...想到可能是vector的原因于是自己封装vector 1987都要超过1s...最后终于想清楚了用3个数组来求... 从1987开始总共花了好几个小时...终于AC... 第一次写树上的归并...还真不好下手啊...感动. Followed by:
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