题干
编写一个函数来查找字符串数组中的最长公共前缀。
如果不存在公共前缀,返回空字符串 ""
。
示例 1:
输入:strs = ["flower","flow","flight"]
输出:"fl"
示例 2:
输入:strs = ["dog","racecar","car"]
输出:""
解释:输入不存在公共前缀。
提示:
1 <= strs.length <= 200
0 <= strs[i].length <= 200
strs[i]
如果非空,则仅由小写英文字母组成
初见
纵向比较每一位,当失配时返回即可。
class Solution {
public String longestCommonPrefix(String[] strs) {
StringBuilder stringBuilder = new StringBuilder();
int minLength = strs[0].length();
for (int i = 1; i < strs.length; i++) {
minLength = minLength < strs[i].length() ? minLength : strs[i].length();
}
for (int i = 0; i < minLength; i++) {
char currentCharacter = strs[0].charAt(i);
for (int j = 1; j < strs.length; j++) {
if (currentCharacter != strs[j].charAt(i)) {
return stringBuilder.toString();
}
}
stringBuilder.append(currentCharacter);
}
return stringBuilder.toString();
}
}