OpenJudge

1067:K-th Number

总时间限制:
5000ms
单个测试点时间限制:
2000ms
内存限制:
65536kB
描述
You are working for Macrohard company in data structures department. After failing your previous task about key insertion you were asked to write a new data structure that would be able to return quickly k-th order statistics in the array segment.
That is, given an array a[1...n] of different integer numbers, your program must answer a series of questions Q(i, j, k) in the form: "What would be the k-th number in a[i...j] segment, if this segment was sorted?"
For example, consider the array a = (1, 5, 2, 6, 3, 7, 4). Let the question be Q(2, 5, 3). The segment a[2...5] is (5, 2, 6, 3). If we sort this segment, we get (2, 3, 5, 6), the third number is 5, and therefore the answer to the question is 5.
输入
The first line of the input file contains n --- the size of the array, and m --- the number of questions to answer (1 <= n <= 100 000, 1 <= m <= 5 000).
The second line contains n different integer numbers not exceeding 109 by their absolute values --- the array for which the answers should be given.
The following m lines contain question descriptions, each description consists of three numbers: i, j, and k (1 <= i <= j <= n, 1 <= k <= j - i + 1) and represents the question Q(i, j, k).
输出
For each question output the answer to it --- the k-th number in sorted a[i...j] segment.
样例输入
7 3
1 5 2 6 3 7 4
2 5 3
4 4 1
1 7 3
样例输出
5
6
3
提示
This problem has huge input,so please use c-style input(scanf,printf),or you may got time limit exceed.
来源
Northeastern Europe 2004, Northern Subregion
全局题号
1106
添加于
2012-09-05
提交次数
9
尝试人数
2
通过人数
1