Handle Score
@Ibrahim Nash 6420
@blackshadows 6380
@mb1973 5642
@Quandray 5233
@akhayrutdinov 5111
@saiujwal13083 4510
@sanjay05 3762
@kirtidee18 3673
@marius_valentin_dragoi 3522
@sushant_a 3459
@verma_ji 3413
Complete Leaderboard
Longest Prefix Suffix
Medium Accuracy: 49.39% Submissions: 10537 Points: 4

Given a string of characters, find the length of the longest proper prefix which is also a proper suffix.

Example 1:

Input: s = "abab"
Output: 2
Explanation: "ab" is the longest proper 
prefix and suffix. 

Example 2:

Input: s = "aaaa"
Output: 3
Explanation: "aaa" is the longest proper 
prefix and suffix. 

Your task:
You do not need to read any input or print anything. The task is to complete the function lps(), which takes a string as input and returns an integer.

Expected Time Complexity: O(|s|)
Expected Auxiliary Space: O(|s|)

1 ≤ |s| ≤ 105
s contains lower case English alphabets

to report an issue on this page.


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


All Submissions

My Submissions:

Login to access your submissions.

Longest Prefix Suffix

Output Window