rust 解法, 执行用时: 0 ms, 内存消耗: 2.1 MB, 提交时间: 2023-09-12 20:21:12

impl Solution {
    pub fn reverse_left_words(s: String, n: i32) -> String {
        String::from(&s[n as usize..]) + &s[..n as usize]
        
        /*
        let n = n as usize;
        [&s[n..], &s[..n]].concat()
        */
    }
}

cpp 解法, 执行用时: 4 ms, 内存消耗: 7.1 MB, 提交时间: 2023-09-12 20:19:53

//方法1---借助额外字符串
class Solution {
public:
    string reverseLeftWords(string s, int n) {
        string ans = s;
        int length = s.size();
        for(int i=0;i<length;i++)
        {
            ans[(i+length-n)%length] = s[i];
        }
        return ans;
    }
};

//方法2---在原字符串上修改
/*
class Solution {
public:
    string reverseLeftWords(string s, int n) {
        //对前n个字符进行翻转
        reverse(s.begin(),s.begin()+n);
        //对剩下的字符进行翻转
        reverse(s.begin()+n,s.end());
        //对整个字符串进行翻转
        reverse(s.begin(),s.end());
        return s;
    }
};
*/

java 解法, 执行用时: 5 ms, 内存消耗: 42.2 MB, 提交时间: 2023-09-12 20:18:35

class Solution {
    public String reverseLeftWords(String s, int n) {
        StringBuilder res = new StringBuilder();
        for(int i = n; i < n + s.length(); i++)
            res.append(s.charAt(i % s.length()));
        return res.toString();
    }
}

java 解法, 执行用时: 3 ms, 内存消耗: 42.4 MB, 提交时间: 2023-09-12 20:18:00

class Solution {
    public String reverseLeftWords(String s, int n) {
        StringBuilder res = new StringBuilder();
        for(int i = n; i < s.length(); i++)
            res.append(s.charAt(i));
        for(int i = 0; i < n; i++)
            res.append(s.charAt(i));
        return res.toString();
    }
}

java 解法, 执行用时: 0 ms, 内存消耗: 41.1 MB, 提交时间: 2023-09-12 20:17:40

class Solution {
    public String reverseLeftWords(String s, int n) {
        return s.substring(n, s.length()) + s.substring(0, n);
    }
}

php 解法, 执行用时: 8 ms, 内存消耗: 19.2 MB, 提交时间: 2023-09-12 20:17:07

class Solution {

    /**
     * @param String $s
     * @param Integer $n
     * @return String
     */
    function reverseLeftWords($s, $n) {
        return substr($s, $n) . substr($s, 0, $n);
    }
}

golang 解法, 执行用时: 0 ms, 内存消耗: 3.1 MB, 提交时间: 2020-11-09 23:09:34

func reverseLeftWords(s string, n int) string {
    return s[n:] + s[:n]
}

python3 解法, 执行用时: 40 ms, 内存消耗: 13.6 MB, 提交时间: 2020-11-09 23:08:32

class Solution:
    def reverseLeftWords(self, s: str, n: int) -> str:
        return s[n:] + s[:n]