Submit | All submissions | Best solutions | Back to list |
ONEXLIS - One X LIS |
For a given sequence a[1], a[2], ... a[n], lets call a subsequence a[k1] ...a[ki]... a[km] (where 1 <= ki <= n and ki
Input
First line contains t, which denotes the number of test cases. 2*T lines follow. Each test case is described using 2 lines.
First line of a test case contains an integer- n, which denotes the number of elements in the array.
Second lines contains n integers, which represent a[i] 1<=i<=n.
1<=t<=20
1<=n<=100000
1<=a[i]<=10^9
Output
For each test case, print one integer which represents the number of integers in the One X LIS. The output for each test case should be printed on a new line.
Example
Input: 2
5
4 3 3 4 1
5
5 4 3 2 1
Output: 4
2
Explanation
In the first test case, the Longest Increasing Subsequence is 3.3.4 whereas the longest One X Subsequence is 4.3.3.4 whose length is 4.
In the second example, any two elements can be chosen to form the longest One X Subsequence, which gives us an answer of 2.
Added by: | TouristGuide |
Date: | 2013-02-03 |
Time limit: | 1s-3s |
Source limit: | 50000B |
Memory limit: | 1536MB |
Cluster: | Cube (Intel G860) |
Languages: | All except: ASM64 |
Resource: | Bytecode 2013 |
hide comments
2022-09-11 23:05:06
Input is fine. The one x increasing subsequence MUST have a k where a[k] > a[k + 1]. Therefore the output to 1 2 3 4 5 is 0 because no subsequence of that sequence satisfies the condition. |
|
2014-01-02 14:36:35 Luka
getting WA. Please check @problem setter. I hope the inputs are fine. |
|
2014-01-01 15:13:05 Amit Jain
what should be output for 1 2 3 4 5??? 0 or 5? |
|
2013-12-27 12:07:34 Miso Forisek
At the moment, the statement is incomplete / incorrect. In some test cases the input is a non-decreasing sequence, and the statement does not define the correct return value in such a case. Apparently, the author expects you to output 0 for such test cases. |
|
2013-10-29 01:40:07 Siwakorn Srisakaokul
This follows from "if there is exactly one i". [edited by misof] Last edit: 2013-12-27 12:04:55 |