Difficulty: Easy
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:
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**Input:** ["flower","flow","flight"]
**Output:** "fl"
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Example 2:
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**Input:** ["dog","racecar","car"]
**Output:** ""
**Explanation:** There is no common prefix among the input strings.
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Note:
All given inputs are in lowercase letters a-z.
Solution
Language: Java
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class {
public String longestCommonPrefix(String[] strs) {
if (strs == null || strs.length == 0)
return "";
int minLen = Integer.MAX_VALUE;
for (String str : strs)
minLen = Math.min(minLen, str.length());
int low = 1;
int high = minLen;
while (low <= high) {
int middle = (low + high) / 2;
if (isCommonPrefix(strs, middle))
low = middle + 1;
else
high = middle - 1;
}
return strs[0].substring(0, (low + high) / 2);
}
private boolean isCommonPrefix(String[] strs, int len){
String str1 = strs[0].substring(0,len);
for (int i = 1; i < strs.length; i++)
if (!strs[i].startsWith(str1))
return false;
return true;
}
}
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class {
public String longestCommonPrefix(String[] strs) {
if (strs == null || strs.length == 0) {
return "";
}
for (int i = 0; i < strs[0].length(); i++) {
char c = strs[0].charAt(i);
for (int j = 1; j < strs.length; j++) {
if (i >= strs[j].length() || strs[j].charAt(i) != c) {
return strs[0].substring(0, i);
}
}
}
return strs[0];
}
}
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