1859. Sorting the Sentence

A sentence is a list of words that are separated by a single space with no leading or trailing spaces. Each word consists of lowercase and uppercase English letters.

A sentence can be shuffled by appending the 1-indexed word position to each word then rearranging the words in the sentence.

  • For example, the sentence "This is a sentence" can be shuffled as "sentence4 a3 is2 This1" or "is2 sentence4 This1 a3".

Given a shuffled sentence s containing no more than 9 words, reconstruct and return the original sentence.

 

Example 1:

Input: s = "is2 sentence4 This1 a3"
Output: "This is a sentence"
Explanation: Sort the words in s to their original positions "This1 is2 a3 sentence4", then remove the numbers.

Example 2:

Input: s = "Myself2 Me1 I4 and3"
Output: "Me Myself and I"
Explanation: Sort the words in s to their original positions "Me1 Myself2 and3 I4", then remove the numbers.

 

Constraints:

  • 2 <= s.length <= 200
  • s consists of lowercase and uppercase English letters, spaces, and digits from 1 to 9.
  • The number of words in s is between 1 and 9.
  • The words in s are separated by a single space.
  • s contains no leading or trailing spaces.

1859. Sorting the Sentence
struct Solution;

impl Solution {
    fn sort_sentence(s: String) -> String {
        let mut pairs: Vec<(String, String)> = s
            .split_whitespace()
            .map(|s| {
                let n = s.len();
                let p = s[n - 1..].to_string();
                let word = s[0..n - 1].to_string();
                (p, word)
            })
            .collect();
        pairs.sort_unstable();
        let words: Vec<String> = pairs.into_iter().map(|(_, word)| word).collect();
        words.join(" ")
    }
}

#[test]
fn test() {
    let s = "is2 sentence4 This1 a3".to_string();
    let res = "This is a sentence".to_string();
    assert_eq!(Solution::sort_sentence(s), res);
    let s = "Myself2 Me1 I4 and3".to_string();
    let res = "Me Myself and I".to_string();
    assert_eq!(Solution::sort_sentence(s), res);
}