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64 lines
1.5 KiB
Markdown
64 lines
1.5 KiB
Markdown
# [14. Longest Common Prefix](https://leetcode.com/problems/longest-common-prefix/)
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## 题目
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Write a function to find the longest common prefix string amongst an array of strings.
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If there is no common prefix, return an empty string "".
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**Example 1**:
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Input: strs = ["flower","flow","flight"]
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Output: "fl"
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**Example 2**:
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Input: strs = ["dog","racecar","car"]
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Output: ""
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Explanation: There is no common prefix among the input strings.
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**Constraints:**
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- 1 <= strs.length <= 200
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- 0 <= strs[i].length <= 200
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- strs[i] consists of only lower-case English letters.
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## 题目大意
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编写一个函数来查找字符串数组中的最长公共前缀。
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如果不存在公共前缀，返回空字符串 ""。
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## 解题思路
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- 对 strs 按照字符串长度进行升序排序，求出 strs 中长度最小字符串的长度 minLen
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- 逐个比较长度最小字符串与其它字符串中的字符，如果不相等就返回 commonPrefix,否则就把该字符加入 commonPrefix
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## 代码
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```go
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package leetcode
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import "sort"
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func longestCommonPrefix(strs []string) string {
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sort.Slice(strs, func(i, j int) bool {
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return len(strs[i]) <= len(strs[j])
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})
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minLen := len(strs[0])
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if minLen == 0 {
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return ""
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}
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var commonPrefix []byte
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for i := 0; i < minLen; i++ {
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for j := 1; j < len(strs); j++ {
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if strs[j][i] != strs[0][i] {
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return string(commonPrefix)
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}
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}
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commonPrefix = append(commonPrefix, strs[0][i])
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}
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return string(commonPrefix)
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}
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``` |