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:
0 <= strs.length <= 200
0 <= strs[i].length <= 200
strs[i]
仅由小写英文字母组成
class Solution:
def longestCommonPrefix(self, strs: List[str]) -> str:
n = len(strs)
if n == 0:
return ''
for i in range(len(strs[0])):
for j in range(1, n):
if len(strs[j]) <= i or strs[j][i] != strs[0][i]:
return strs[0][:i]
return strs[0]
class Solution {
public String longestCommonPrefix(String[] strs) {
int n;
if ((n = strs.length) == 0) return "";
for (int i = 0; i < strs[0].length(); ++i) {
for (int j = 1; j < n; ++j) {
if (strs[j].length() <= i || strs[j].charAt(i) != strs[0].charAt(i)) {
return strs[0].substring(0, i);
}
}
}
return strs[0];
}
}
class Solution {
public:
string longestCommonPrefix(vector<string>& strs) {
int n;
if ((n = strs.size()) == 0) return "";
for (int i = 0; i < strs[0].size(); ++i) {
for (int j = 1; j < n; ++j) {
if (strs[j].size() <= i || strs[j][i] != strs[0][i]) {
return strs[0].substr(0, i);
}
}
}
return strs[0];
}
};