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Strings - Longest Common PrefixGiven the array of strings A, you need to find the longest common string S which is the prefix of all the strings present in the array.For example, you are given an array of two strings S1 and S2.S1 = "abcdefgh"S2 = "abcefgh"Longest common prefix of S1 and S2 is "abc"Note: Assume that there always exists some common prefix among the stringsConstraints:0 <= length of array <= 104Input Format:First line of input contains an integer N representing the size of the arrayNext N lines contains strings of the array A, each in a line.Output Format:Print the longest common prefix of all strings of ASample Test CasesTest Case 1:Expected Output:5programmerprogrammingprogramprogramaticprogramableprogramTest Case 2:Expected Output:4appleapplepieapple tree apple phoneapple

Question

Strings - Longest Common PrefixGiven the array of strings A, you need to find the longest common string S which is the prefix of all the strings present in the array.For example, you are given an array of two strings S1 and S2.S1 = "abcdefgh"S2 = "abcefgh"Longest common prefix of S1 and S2 is "abc"Note: Assume that there always exists some common prefix among the stringsConstraints:0 <= length of array <= 104Input Format:First line of input contains an integer N representing the size of the arrayNext N lines contains strings of the array A, each in a line.Output Format:Print the longest common prefix of all strings of ASample Test CasesTest Case 1:Expected Output:5programmerprogrammingprogramprogramaticprogramableprogramTest Case 2:Expected Output:4appleapplepieapple tree apple phoneapple

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Solution

Here is a step-by-step solution to find the longest common prefix in an array of strings:

  1. Initialize a variable prefix with the first string in the array. This will be our starting point.

  2. Loop through the array starting from the second string. For each string, we will compare it with the current prefix.

  3. Inside the loop, initialize a variable i to 0. This will be used to iterate through the characters of the current string and the prefix.

  4. Create a while loop where i is less than the length of both the current string and the prefix. Inside this loop, if the character at index i in the current string is not equal to the character at index i in the prefix, break the loop. If they are equal, increment i.

  5. After the while loop, update the prefix to be the substring of the current string from index 0 to i. This is because the common prefix can only be as long as the shortest string in the array.

  6. After the outer loop, the prefix will be the longest common prefix of all the strings in the array.

  7. Print the prefix.

This algorithm works by continuously updating the prefix to be the longest common prefix of the processed strings. It starts with the first string as the prefix and for each subsequent string, it updates the prefix to be the longest common prefix of the prefix and the current string. This ensures that the prefix is always the longest common prefix of all processed strings.

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Similar Questions

Test time left: 41:32Strings - Longest Common PrefixGiven the array of strings A, you need to find the longest common string S which is the prefix of all the strings present in the array.For example, you are given an array of two strings S1 and S2.S1 = "abcdefgh"S2 = "abcefgh"Longest common prefix of S1 and S2 is "abc"Note: Assume that there always exists some common prefix among the stringsConstraints:0 <= length of array <= 104Input Format:First line of input contains an integer N representing the size of the arrayNext N lines contains strings of the array A, each in a line.Output Format:Print the longest common prefix of all strings of ASample Test Cases

Write a function to find the longest common prefix string amongst an array of strings.If there is no common prefix, return an empty string "". Example 1:Input: strs = ["flower","flow","flight"]Output: "fl"Example 2:Input: strs = ["dog","racecar","car"]Output: ""Explanation: There is no common prefix among the input strings. Constraints:1 <= strs.length <= 2000 <= strs[i].length <= 200strs[i] consists of only lowercase English letters.

iven an array of N strings, find the longest common prefix among all strings present in the array.Example 1:Input:N = 4arr[] = {geeksforgeeks, geeks, geek,  geezer}Output: geeExplanation: "gee" is the longest commonprefix in all the given strings.

Given a string s, find the length of the longest substring without repeating characters.

Given two strings text1 and text2, return the length of their longest common subsequence. If there is no common subsequence, return 0.A subsequence of a string is a new string generated from the original string with some characters (can be none) deleted without changing the relative order of the remaining characters.For example, "ace" is a subsequence of "abcde".A common subsequence of two strings is a subsequence that is common to both strings. Example 1:Input: text1 = "abcde", text2 = "ace" Output: 3 Explanation: The longest common subsequence is "ace" and its length is 3.

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