题目链接:https://vjudge.net/problem/HDU-6040 题目大意: 给出 \(n\) 个数,有 \(m\) 次询问,每次询问这 \(n\) 个数中第 \(k+1\) 大的数是什么. 另有附加限制:对于 \(n\) 个数中的任意三个数 \(a,b,c\),如果满足 \(a \not= b, a < c, b < c\),则有 \(a + b \le c\). \((1 \le n \le 10^{7}, 1 \le m \le 100)\) 解题思路: 由附加限制不难联…

Hints of sd0061 Time Limit: 5000/2500 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 2262    Accepted Submission(s): 673 Problem Description sd0061, the legend of Beihang University ACM-ICPC Team, retired last yea…

Hints of sd0061 Time Limit: 5000/2500 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 492    Accepted Submission(s): 106 Problem Description sd0061, the legend of Beihang University ACM-ICPC Team, retired last year…

Hints of sd0061 Problem Description sd0061, the legend of Beihang University ACM-ICPC Team, retired last year leaving a group of noobs. Noobs have no idea how to deal with m coming contests. sd0061 has left a set of hints for them. There are n noobs…

/* HDU 6040 - Hints of sd0061 [ 第k小数查询,剪枝 ] 题意: 给出随机数列 a[N] (N < 1e7) 询问 b[M] (M < 100) ,对于每个询问输出第 b[i]+1小的数字 满足对任意 i,j,k,若b[i] <= b[k] && b[j] <= b[k] 则一定有 b[i]+b[j] <= b[k] 分析: 用 nth_element() 解决第k小数问题 先将询问排序,可以从小到大或从大到小解决,就能每次不断缩…

Hints of sd0061 Time Limit: 5000/2500 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 2297    Accepted Submission(s): 687 Problem Description sd0061, the legend of Beihang University ACM-ICPC Team, retired last yea…

[题目链接] http://acm.hdu.edu.cn/showproblem.php?pid=6040 [题目大意] 给出一个随机数生成器,有m个询问,问第bi小的元素是啥 询问中对于bi<bk,bj<bk,有bi+bj<=bk [题解] (By Claris)对于所有的数字,我们将其按照高位分类,统计每个高16位有几个数字, 然后定位每个询问的高16位是什么,因为只有100个高16位是被询问到的, 把这100个高16位的数放入桶里,每次暴力查找,因为数据随机, 因此每个高16位期望…

[题目链接] http://acm.hdu.edu.cn/showproblem.php?pid=6040 [题目大意] 给出一个随机数生成器,有m个询问,问第bi小的元素是啥 询问中对于bi<bk,bj<bk,有bi+bj<=bk [题解] 我们将所有的询问排序,我们发现倒着处理询问的时候询问区间大小下降非常快, nth_element(start,start+k,end) 可以近似O(n)查询区间中第k小的数字, 并且在处理后保证比第k小小的数字均在其前面(虽然不一定有序), 所以我…

这几天做了几道随机生成数组的题,且需要用nth-elemeng函数,并且都是北航出的多校题…… 首先我们先贴一下随机生成数组函数的代码: unsigned x = A, y = B, z = C; unsigned rng61() { unsigned t; x ^= x << ; x ^= x >> ; x ^= x << ; t = x; x = y; y = z; z = t ^ x ^ y; return z; } 这个函数的原理原谅我不太懂,就不多说了-_-|…

Hints of sd0061 Time Limit: 5000/2500 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 2421    Accepted Submission(s): 736 Problem Description sd0061, the legend of Beihang University ACM-ICPC Team, retired last yea…