# Longest Common Prefix Leetcode Solution

#### ByBrokenprogrammers

Nov 30, 2022

In this post, you will know how to solve the Longest Common Prefix Leetcode Solution problem of Leetcode. This Leetcode problem is done in many programming languages like C++, Java, and Python.

One more thing to add, don’t directly look for the solutions, first try to solve the problems of Leetcode by yourself. If you find any difficulty after trying several times, then you can look for solutions.

## Problem

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 <= 200`
• `0 <= strs[i].length <= 200`
• `strs[i]` consists of only lowercase English letters.

### Longest Common Prefix Leetcode Solutions in Python

```class Solution:
def longestCommonPrefix(self, strs):
if len(strs) == 0:
return ""
commonPrefix = strs[0]
for string in strs:
commonPrefix = self.findPrefix(commonPrefix,string)
return commonPrefix
def findPrefix(self,prefix, string):
while prefix is not "":

if string.startswith(prefix):

return prefix
else:
prefix = prefix[:-1]
return ""```

### Longest Common Prefix Leetcode Solutions in CPP

```class Solution {
public:
string longestCommonPrefix(vector<string>& strs)
{
if (strs.size() == 0)
return "";
int maxL = strs[0].length();
bool match = true;
int j = 0;
for (int i = 1; i < strs.size(); i++)
{
if ((strs[i]).length() == 0 || (strs[i])[0] != (strs[0])[0])
return "";
while (match && j < maxL && j < strs[i].length())
{
match = ((strs[i])[j] == (strs[0])[j]);
j++;
}
if (!match)
maxL = j - 1;
if (strs[i].length() < maxL)
maxL = strs[i].length();
j = 0;
match = true;
}
return strs[0].substr(0, maxL);
}
};```

### Longest Common Prefix Leetcode Solutions in Java

```class Solution {
public String longestCommonPrefix(String[] strs) {
if(strs.length == 0){
return "";
}
String pref = strs[0];
for(String s : strs){
int len = Math.min(pref.length(), s.length());
for(int i = len; i >= 0; i--){
if(pref.indexOf(s.substring(0, i)) == 0){
pref = s.substring(0, i);
break;
}
}
}
return pref;
}
}```

Note: This problem Longest Common Prefix is generated by Leetcode but the solution is provided by BrokenProgrammers. This tutorial is only for Educational and Learning purposes.