题目链接:hdu_5805_NanoApe Loves Sequence 题意: 给你n个数,现在要删一个数,删每个数的概率是一样的,现在问你删一个值后的相邻数绝对值最大差的期望是多少,因为担心精度误差,让你答案乘n 题解: 先算出不删数的绝对值最大的差ma并记录位置,如果要删的数不是刚才求出来的位置,那么ans+=max(abs(a[i-1]-a[i+1],ma).如果是,那么重新求一下最大值就行了,因为最多重求两次,所以总复杂度还是O(n). #include<cstdio> #inclu…

NanoApe Loves Sequence Accepts: 531 Submissions: 2481 Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 262144/131072 K (Java/Others) Problem Description NanoApe, the Retired Dog, has returned back to prepare for the National Higher Education Entr…

题目链接: NanoApe Loves Sequence Ⅱ Time Limit: 4000/2000 MS (Java/Others)     Memory Limit: 262144/131072 K (Java/Others) Problem Description NanoApe, the Retired Dog, has returned back to prepare for for the National Higher Education Entrance Examinatio…

传送门 NanoApe Loves Sequence Ⅱ Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 262144/131072 K (Java/Others)Total Submission(s): 1585    Accepted Submission(s): 688 Description NanoApe, the Retired Dog, has returned back to prepare for for the…

传送门 NanoApe Loves Sequence Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 262144/131072 K (Java/Others) Total Submission(s): 1323    Accepted Submission(s): 521 Description NanoApe, the Retired Dog, has returned back to prepare for the Natio…

NanoApe Loves Sequence Ⅱ  Accepts: 374  Submissions: 946  Time Limit: 4000/2000 MS (Java/Others)  Memory Limit: 262144/131072 K (Java/Others) 问题描述 退役狗 NanoApe 滚回去学文化课啦! 在数学课上,NanoApe 心痒痒又玩起了数列.他在纸上随便写了一个长度为 nn 的数列,他又根据心情写下了一个数 mm. 他想知道这个数列中有多少个区间里的第…

题目连接 http://acm.hdu.edu.cn/showproblem.php?pid=5273 Dylans loves sequence Description Dylans is given $N$ numbers $a[1]....a[N]$ And there are $Q$ questions. Each question is like this $(L,R)$ his goal is to find the “inversions” from number $L$ to n…

Dylans loves sequence Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://acm.hdu.edu.cn/showproblem.php?pid=5273 Description Dylans得到了N个数a[1]...a[N].有Q个问题,每个问题形如(L,R)他需要求出L−R这些数中的逆序对个数.更加正式地,他需要求出二元组(x,y)的个数,使得L≤x,y≤R且x<y且a[x]>a[y] Input 第一行有两个数N和Q…

NanoApe Loves Sequence Ⅱ 题目链接: http://acm.hdu.edu.cn/showproblem.php?pid=5806 Description NanoApe, the Retired Dog, has returned back to prepare for for the National Higher Education Entrance Examination! In math class, NanoApe picked up sequences on…

NanoApe Loves Sequence 题目链接: http://acm.hdu.edu.cn/showproblem.php?pid=5805 Description NanoApe, the Retired Dog, has returned back to prepare for the National Higher Education Entrance Examination! In math class, NanoApe picked up sequences once aga…