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Find the longest common prefix in an array of strings (Longest Common Prefix) |...
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Find the longest common prefix in an array of strings (Longest Common Prefix)
29 Jul 2012 1 Comment
by Runhe Tian in LeetCode Tags: Array, C++, Java, String
Write a function to find the longest common prefix string amongst an array of strings.
Thoughts:
Apparently this can be done in . We start with the first string as the longest common prefix. We then go through every string in the array and compare the prefix with them. Update (shorten) the prefix if needed.
Code (Java):
public
class
Solution {
public
String longestCommonPrefix(String[] strs) {
String prefix =
new
String();
if
(strs.length >
0
)
prefix = strs[
0
];
for
(
int
i =
1
; i < strs.length; ++i) {
String s = strs[i];
int
j =
0
;
for
(; j < Math.min(prefix.length(), s.length()); ++j) {
if
(prefix.charAt(j) != s.charAt(j)) {
break
;
}
}
prefix = prefix.substring(
0
, j);
}
return
prefix;
}
}
Code (C++):
class
Solution {
public
:
string longestCommonPrefix(vector<string> &strs) {
string prefix;
if
(strs.size() > 0)
prefix = strs[0];
for
(
int
i = 1; i < strs.size(); ++i) {
string s = strs[i];
int
j = 0;
for
(; j < min(prefix.size(), s.size()); ++j) {
if
(prefix[j] != s[j])
break
;
}
prefix = prefix.substr(0, j);
}
return
prefix;
}
};
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