2016暑假多校联合---World is Exploding Problem Description Given a sequence A with length n,count how many quadruple (a,b,c,d) satisfies: a≠b≠c≠d,1≤a<b≤n,1≤c<d≤n,Aa<Ab,Ac>Ad.   Input The input consists of multiple test cases. Each test case begin wit…

转载自:http://blog.csdn.net/queuelovestack/article/details/52096337 [题意]给你一个序列A,选出四个下标不同的元素,下标记为a,b,c,d a≠b≠c≠d,1≤a<b≤n,1≤c<d≤n 满足Aa<Ab,Ac>Ad 问能找到多少个这样的四元组(a,b,c,d) [类型]树状数组应用 [分析]因为a<b,c<d,Aa<Ab,Ac>Ad 所以我们暂时称(a,b)为递增对,(c,d)为递减对 题目就转化…

题目链接: http://acm.hdu.edu.cn/showproblem.php?pid=5792 World is Exploding Time Limit: 2000/1000 MS (Java/Others)Memory Limit: 65536/65536 K (Java/Others) 问题描述 输入 The input consists of multiple test cases. Each test case begin with an integer n in a sin…

http://acm.hdu.edu.cn/showproblem.php?pid=5792 1012 World is Exploding 题意:选四个数,满足a<b and A[a]<A[b]   c<d and A[c]>A[d] 问有几个这样的集合 思路: 树状数组+离线化 先处理出每个数左边比它小 大,右边比它大 小的数目,用cnt[][i]表示.最后统计一下减去重复的就可以 #include <iostream> #include <cstdio>…

World is Exploding 题目链接: http://acm.hdu.edu.cn/showproblem.php?pid=5792 Description Given a sequence A with length n,count how many quadruple (a,b,c,d) satisfies: a≠b≠c≠d,1≤a < b≤n,1≤c < d≤n,Aa < Ab,Ac > Ad. Input The input consists of multipl…

题目链接:hdu_5792_World is Exploding 题意: 给你一个数列,让你找有多少个(a,b,c,d)满足a≠b≠c≠d,1≤a<b≤n,1≤c<d≤n,Aa<Ab,Ac>Ad. 题解: 如果abcd可以相等,那么就是所有的顺序对和逆序对相乘,但这里要不相等,所以我们减去相等的情况就行. 要满足Aa<Ab,Ac>Ad,考虑其中一个数Ai 然后我们可以发现,建立在Ai的顺序对和逆序上,bd不会相等, 所以我们只需要找出每一个Ai 前后顺序对和逆序对,然后…

World is Exploding 题目连接: http://acm.hdu.edu.cn/showproblem.php?pid=5792 Description Given a sequence A with length n,count how many quadruple (a,b,c,d) satisfies: a≠b≠c≠d,1≤a<b≤n,1≤c<d≤n,Aa<Ab,Ac>Ad. Input The input consists of multiple test c…

(1)梯度不稳定问题: 什么是梯度不稳定问题:深度神经网络中的梯度不稳定性,前面层中的梯度或会消失,或会爆炸. 原因:前面层上的梯度是来自于后面层上梯度的乘乘积.当存在过多的层次时,就出现了内在本质上的不稳定场景,如梯度消失和梯度爆炸. (2)梯度消失(vanishing gradient problem): 原因:例如三个隐层.单神经元网络: 则可以得到: 然而,sigmoid方程的导数曲线为: 可以看到,sigmoid导数的最大值为1/4,通常abs(w)<1,则: 前面的层比后面的层梯度变…

The unstable gradient problem: The fundamental problem here isn't so much the vanishing gradient problem or the exploding gradient problem. It's that the gradient in early layers is the product of terms from all the later layers. When there are many…

题目链接: World is Exploding Time Limit: 2000/1000 MS (Java/Others)     Memory Limit: 65536/65536 K (Java/Others) Problem Description Given a sequence A with length n,count how many quadruple (a,b,c,d) satisfies: a≠b≠c≠d,1≤a<b≤n,1≤c<d≤n,Aa<Ab,Ac>A…