- What is a time complexity for finding the longest substring that is common?
- How do you find the longest substring between two strings?
- What is the time complexity for finding the longest?
- How do you find the longest common sequence?
- What is longest common subsequence problem describe a technique to solve it?
- Which of the following problems can be solved using the longest sub sequence problem?

## What is a time complexity for finding the longest substring that is common?

O(n * m)

Since we are using two for loops for both the strings ,therefore the time complexity of finding the longest common substring using dynamic programming approach is O(n * m) where n and m are the lengths of the strings.

### How do you find the longest substring between two strings?

The longest common substrings of a set of strings can be found by building a generalized suffix tree for the strings, and then finding the deepest internal nodes which have leaf nodes from all the strings in the subtree below it.

**How do you find the largest substring?**

Recursive Approach

- Initialise a variable res, to count the longest common substring.
- Let i and j be the index of the str1 and str2 pointing to the last character of both the strings.
- If both the characters are the same, i.e. str1[i] == str2[j], increment the value of res by 1.

**What is the time complexity of following recurrence relation of longest common subsequence?**

Explanation: The time complexity of the brute force algorithm used to find the longest common subsequence is O(2n).

## What is the time complexity for finding the longest?

The desired time complexity is O(n) where n is the length of the string….Given a string str, find the length of the longest substring without repeating characters.

- For “ABDEFGABEF”, the longest substring are “BDEFGA” and “DEFGAB”, with length 6.
- For “BBBB” the longest substring is “B”, with length 1.

### How do you find the longest common sequence?

The value in the last row and the last column is the length of the longest common subsequence. In order to find the longest common subsequence, start from the last element and follow the direction of the arrow. The elements corresponding to () symbol form the longest common subsequence.

**What is the time complexity for finding the longest substring that is common in string S1 and S2?**

The time complexity for finding the longest substring that is common in string S1 and S2 is Ɵ (n1 + n2).

**How do you find the common substring?**

Check if two strings have a common substring

- You are given two strings str1 and str2.
- A basic approach runs in O(n^2), where we compare every character of string 1 with every character of string 2 and replace every matched character with a “_” and set flag variable as true.
- Output :
- Time Complexity : O(n)

## What is longest common subsequence problem describe a technique to solve it?

The longest common subsequence (LCS) is defined as the longest subsequence that is common to all the given sequences, provided that the elements of the subsequence are not required to occupy consecutive positions within the original sequences.

### Which of the following problems can be solved using the longest sub sequence problem?

C. D. Explanation: both recursion and dynamic programming can be used to solve the longest subsequence problem.

**What is time complexity for finding longest substring that is common in string S1 and S2?**

**What is the longest continuous non repeating substring given a string of input?**

Explanation: “abc” is the longest substring without repeating characters among all the substrings. Explanation: “wke” is the longest substring without repeating characters among all the substrings.