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
Question
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
Solution
Sure, here is a step-by-step solution in Python:
- First, we need to define a function to find the common prefix between two strings. We can do this by comparing characters one by one from the start of each string until we find a mismatch.
def common_prefix(str1, str2):
n1 = len(str1)
n2 = len(str2)
j = 0
i = 0
s = ""
while(i < n1 and j < n2):
if (str1[i] != str2[j]):
break
s += (str1[i])
i += 1
j += 1
return (s)
- Now, we need to find the longest common prefix among all strings in the array. We can do this by initializing the common prefix as the first string in the array. Then, for each subsequent string, we update the common prefix to be the common prefix of the current common prefix and the current string.
def longest_common_prefix(arr, n):
prefix = arr[0]
for i in range (1, n):
prefix = common_prefix(prefix, arr[i])
return (prefix)
- Finally, we need to read the input, call our function, and print the result.
n = int(input())
arr = []
for i in range(n):
arr.append(input())
print(longest_common_prefix(arr, n))
This program will print the longest common prefix of all strings in the array.
Similar Questions
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
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 a string s, find the length of the longest substring without repeating characters. Example 1:Input: s = "abcabcbb"Output: 3Explanation: The answer is "abc", with the length of 3.Example 2:Input: s = "bbbbb"Output: 1Explanation: The answer is "b", with the length of 1.Example 3:Input: s = "pwwkew"Output: 3Explanation: The answer is "wke", with the length of 3.Notice that the answer must be a substring, "pwke" is a subsequence and not a substring. Constraints:0 <= s.length <= 5 * 104s consists of English letters, digits, symbols and spaces.
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