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Farmer John's cows have discovered that the clover growing along the ridge of the hill (which we can think of as a one-dimensional number line) in his field is particularly good. Farmer John has N cows (we number the cows from 1 to N). Each of Farmer Joh

N (2 <= N <= 8,000) cows have unique brands in the range 1..N. In a spectacular display of poor judgment, they visited the neighborhood 'watering hole' and drank a few too many beers before dinner. When it was time to line up for their evening meal, they d

最近在看树状数组，看了很长时间，理解的还是很透。 总感觉树状数组很神奇，特别是那段lowbit()函数，简直是妙不可言啊！ 为了验证自己看的知识，所以就刷了一道水题，真的是很水的一道题，求逆序数的，在之前，我都是用归并求逆序数的，我记得是0ms通过 今天用了树状数组，也是0ms. 由于树状数组看的不太明白，所以不敢再这多言，怕误导了大家。因为实在是被他的神奇之处所震撼了，短短的十几行代码，

Problem Description Astronomers often examine star maps where stars are represented by points on a plane and each star has Cartesian coordinates. Let the level of a star be an amount of the stars that are not higher and not to the right of the given star.

In this problem, you have to analyze a particular sorting algorithm. The algorithm processes a sequence of n distinct integers by swapping two adjacent sequence elements until the sequence is sorted in ascending order. For the input sequence 9 1 0 5 4 ,

n 个小朋友站成一排。现在要把他们按身高从低到高的顺序排列，但是每次只能交换位置相邻的两个小朋友。 　　每个小朋友都有一个不高兴的程度。开始的时候，所有小朋友的不高兴程度都是0。 　　如果某个小朋友第一次被要求交换，则他的不高兴程度增加1，如果第二次要求他交换，则他的不高兴程度增加2（即不高兴程度为3），依次类推。当要求某个小朋友第k次交换时，他的不高兴程度增加k。 　　请问，要让所有小朋友按从低到高排队，他们的不高兴程度之和最小是多少。 　　如果有两个小朋友身高一样，则他们谁站在谁前面是没有关系的

Twin Prime Conjecture Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 3211    Accepted Submission(s): 1138 Problem Description If we de