
题目描述
给你一个日志数组 logs
。每条日志都是以空格分隔的字串,其第一个字为字母与数字混合的 标识符 。
有两种不同类型的日志:
- 字母日志:除标识符之外,所有字均由小写字母组成
- 数字日志:除标识符之外,所有字均由数字组成
请按下述规则将日志重新排序:
- 所有 字母日志 都排在 数字日志 之前。
- 字母日志 在内容不同时,忽略标识符后,按内容字母顺序排序;在内容相同时,按标识符排序。
- 数字日志 应该保留原来的相对顺序。
返回日志的最终顺序。
示例 1:
输入:logs = ["dig1 8 1 5 1","let1 art can","dig2 3 6","let2 own kit dig","let3 art zero"]
输出:["let1 art can","let3 art zero","let2 own kit dig","dig1 8 1 5 1","dig2 3 6"]
解释:
字母日志的内容都不同,所以顺序为 "art can", "art zero", "own kit dig" 。
数字日志保留原来的相对顺序 "dig1 8 1 5 1", "dig2 3 6" 。
示例 2:
输入:logs = ["a1 9 2 3 1","g1 act car","zo4 4 7","ab1 off key dog","a8 act zoo"]
输出:["g1 act car","a8 act zoo","ab1 off key dog","a1 9 2 3 1","zo4 4 7"]
提示:
1 <= logs.length <= 100
3 <= logs[i].length <= 100
logs[i]
中,字与字之间都用 单个 空格分隔
- 题目数据保证
logs[i]
都有一个标识符,并且在标识符之后至少存在一个字
解法
方法一:自定义排序
我们可以使用自定义排序的方法,将日志分为两类:字母日志和数字日志。
对于字母日志,我们需要按照题目要求进行排序,即先按内容排序,再按标识符排序。
对于数字日志,我们只需要保留原来的相对顺序。
时间复杂度 \(O(n \times \log n)\),空间复杂度 \(O(n)\)。其中 \(n\) 是日志的数量。
| class Solution:
def reorderLogFiles(self, logs: List[str]) -> List[str]:
def f(log: str):
id_, rest = log.split(" ", 1)
return (0, rest, id_) if rest[0].isalpha() else (1,)
return sorted(logs, key=f)
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23 | class Solution {
public String[] reorderLogFiles(String[] logs) {
Arrays.sort(logs, (log1, log2) -> {
String[] split1 = log1.split(" ", 2);
String[] split2 = log2.split(" ", 2);
boolean isLetter1 = Character.isLetter(split1[1].charAt(0));
boolean isLetter2 = Character.isLetter(split2[1].charAt(0));
if (isLetter1 && isLetter2) {
int cmp = split1[1].compareTo(split2[1]);
if (cmp != 0) {
return cmp;
}
return split1[0].compareTo(split2[0]);
}
return isLetter1 ? -1 : (isLetter2 ? 1 : 0);
});
return logs;
}
}
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27 | class Solution {
public:
vector<string> reorderLogFiles(vector<string>& logs) {
stable_sort(logs.begin(), logs.end(), [](const string& log1, const string& log2) {
int idx1 = log1.find(' ');
int idx2 = log2.find(' ');
string id1 = log1.substr(0, idx1);
string id2 = log2.substr(0, idx2);
string content1 = log1.substr(idx1 + 1);
string content2 = log2.substr(idx2 + 1);
bool isLetter1 = isalpha(content1[0]);
bool isLetter2 = isalpha(content2[0]);
if (isLetter1 && isLetter2) {
if (content1 != content2) {
return content1 < content2;
}
return id1 < id2;
}
return isLetter1 > isLetter2;
});
return logs;
}
};
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23 | func reorderLogFiles(logs []string) []string {
sort.SliceStable(logs, func(i, j int) bool {
log1, log2 := logs[i], logs[j]
idx1 := strings.IndexByte(log1, ' ')
idx2 := strings.IndexByte(log2, ' ')
id1, content1 := log1[:idx1], log1[idx1+1:]
id2, content2 := log2[:idx2], log2[idx2+1:]
isLetter1 := 'a' <= content1[0] && content1[0] <= 'z'
isLetter2 := 'a' <= content2[0] && content2[0] <= 'z'
if isLetter1 && isLetter2 {
if content1 != content2 {
return content1 < content2
}
return id1 < id2
}
return isLetter1 && !isLetter2
})
return logs
}
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19 | function reorderLogFiles(logs: string[]): string[] {
return logs.sort((log1, log2) => {
const [id1, content1] = log1.split(/ (.+)/);
const [id2, content2] = log2.split(/ (.+)/);
const isLetter1 = isNaN(Number(content1[0]));
const isLetter2 = isNaN(Number(content2[0]));
if (isLetter1 && isLetter2) {
const cmp = content1.localeCompare(content2);
if (cmp !== 0) {
return cmp;
}
return id1.localeCompare(id2);
}
return isLetter1 ? -1 : isLetter2 ? 1 : 0;
});
}
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33 | use std::cmp::Ordering;
impl Solution {
pub fn reorder_log_files(logs: Vec<String>) -> Vec<String> {
let mut logs = logs;
logs.sort_by(|log1, log2| {
let split1: Vec<&str> = log1.splitn(2, ' ').collect();
let split2: Vec<&str> = log2.splitn(2, ' ').collect();
let is_letter1 = split1[1].chars().next().unwrap().is_alphabetic();
let is_letter2 = split2[1].chars().next().unwrap().is_alphabetic();
if is_letter1 && is_letter2 {
let cmp = split1[1].cmp(split2[1]);
if cmp != Ordering::Equal {
return cmp;
}
return split1[0].cmp(split2[0]);
}
if is_letter1 {
Ordering::Less
} else if is_letter2 {
Ordering::Greater
} else {
Ordering::Equal
}
});
logs
}
}
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