Table of Contents

## How do you find the largest substring?

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 longest substring of two strings?**

Simple Approach

- Find all the substrings of sequence 1 in O(n^2)
- Iterate through sequence 2 and check whether the current substring is a substring of this string in O(m)
- Maximize the length of all the common substrings.

**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 common substrings?

To find common substrings between two strings with Python, we can use the difflib module. We have 2 strings string1 and string2 that we want to find the common substring that’s in both strings. To do that, we use the SequenceMatcher class with string1 and string2 .

**How do you find the longest common Subarray?**

Naive Approach: The idea is to generate all the subarrays of the two given array A[] and B[] and find the longest matching subarray. This solution is exponential in terms of time complexity. Time Complexity: O(2N+M), where N is the length of the array A[] and M is the length of the array B[].

**How do you find the longest common subsequence in two strings in C?**

Implementation LCS algorithm in C programming language

- // The longest common subsequence in C.
- #include
- #include
- int i, j, m, n, LCS_table[20][20];
- char S1[20] = “abaaba”, S2[20] = “babbab”, b[20][20];
- void lcsAlgo() {
- m = strlen(S1);
- n = strlen(S2);

## How do you find the common substring of two strings?

For every character in string 1 we increment vector index of that character eg: v[s1[i]-‘a’]++, for every character of string 2 we check vector for the common characters if v[s2[i]-‘a’] > 0 then set flag = true and v[s2[i]-‘a’]– such that one character of string 2 is compared with only one character of string 1.

**How do you find the common substring between two strings?**

**How do you find longest substring without repeating characters in a string?**

Run a loop from i = 0 till N – 1 and consider a visited array. Run a nested loop from j = i + 1 to N – 1 and check whether the current character S[j] has already been visited. If true, break from the loop and consider the next window. Else, mark the current character as visited and maximize the length as j – i + 1.

### How do you find the smallest common substring?

Given two strings str1 and str2, the task is to find the length of the shortest string that has both str1 and str2 as subsequences. Examples : Input: str1 = “geek”, str2 = “eke” Output: 5 Explanation: String “geeke” has both string “geek” and “eke” as subsequences.

**Which method can be used to solve the longest common subsequence problem?**

1. Which of the following methods can be used to solve the longest common subsequence problem? Explanation: Both recursion and dynamic programming can be used to solve the longest subsequence problem.

**How do you find common characters in two strings?**

Approach: Count the frequencies of all the characters from both strings. Now, for every character if the frequency of this character in string s1 is freq1 and in string s2 is freq2 then total valid pairs with this character will be min(freq1, freq2). The sum of this value for all the characters is the required answer.

## How do you find the length of the longest substring without repeating characters Python?

Longest Substring Without Repeating Characters in Python

- if s[j] is not present in map, or i > map[s[j]], then. ans := max(ans, j – i + 1) map[s[j]] := j.
- otherwise. i := map[s[j]] + 1. ans := max(ans, j – i + 1) decrease j by 1.
- increase j by 1.

**How do you find the maximum occurring character in a string?**

Algorithm for Maximum Occurring Character

- Initialize the hash table of size 256 with zeros.
- Iterate over the input string and store the frequency of each element in the hash table.
- Take the character with the maximum frequency as an answer.
- Print the answer.

**How do you find a common substring in two strings?**

- 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)