Sorted subsequence of size 3
Easy Accuracy: 45.69% Submissions: 26497 Points: 2

Given an array A of N integers, find any 3 elements in it such that A[i] < A[j] < A[k] and i < j < k.

Example 1:

Input:
N = 5
A[] = {1,2,1,1,3}
Output: 1
Explanation: a sub-sequence 1 2 3 exist.

Example 2:

Input:
N = 3
A[] = {1,1,3}
Output: 0
Explanation: no such sub-sequence exist.

Your Task:
Your task is to complete the function find3Numbers which finds any 3 elements in it such that A[i] < A[j] < A[k] and i < j < k. You need to return them as a vector/ArrayList/array (depending on the language cpp/Java/Python), if no such element is present then return the empty vector of size 0.

Note: The output will be 1 if the sub-sequence returned by the function is present in array A else 0. If the sub-sequence returned by the function is not in the format as mentioned then the output will be -1.

Expected Time Complexity: O(N)
Expected Auxiliary Space: O(N)

Constraints:
1 <= N <= 105
1 <= A[i] <= 106, for each valid i

Note: The Input/Output format and Examples given are used for the system's internal purpose, and should be used by a user for Expected Output only. As it is a function problem, hence a user should not read any input from stdin/console. The task is to complete the function specified, and not to write the full code.

We are replacing the old Disqus forum with the new Discussions section given below.
Click here to view old Disqus comments.


to report an issue on this page.

Editorial

We strongly recommend solving this problem on your own before viewing its editorial. Do you still want to view the editorial?

Yes

All Submissions

My Submissions:

Login to access your submissions.

Sorted subsequence of size 3

Output Window