20240509 Finished

This commit is contained in:
jackfiled 2024-05-09 23:39:23 +08:00
parent 7f7f30b76f
commit e54e03c4f3
2 changed files with 109 additions and 1 deletions

View File

@ -126,3 +126,4 @@ mod p383_ransom_note;
mod p290_word_pattern;
mod p205_isomorphic_strings;
mod p242_valid_anagram;
mod p49_group_anagrams;

View File

@ -0,0 +1,107 @@
/**
* [49] Group Anagrams
*/
pub struct Solution {}
// submission codes start here
use std::{collections::HashMap, hash::Hash};
#[derive(Debug)]
struct WordState {
characters: HashMap<char, usize>,
}
impl PartialEq for WordState {
fn eq(&self, other: &Self) -> bool {
if self.characters.len() != other.characters.len() {
return false;
}
for (c, &v) in self.characters.iter() {
match other.characters.get(c) {
Some(other_v) => {
if *other_v != v {
return false;
}
}
None => {
return false;
}
}
}
true
}
}
impl Eq for WordState {}
impl Hash for WordState {
fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
let mut chars: Vec<(&char, &usize)> =
self.characters.iter().map(|p| p).collect();
chars.sort_by_key(|p| p.0);
for (&c, &v) in chars {
c.hash(state);
v.hash(state);
}
}
}
impl Solution {
pub fn group_anagrams(strs: Vec<String>) -> Vec<Vec<String>> {
let mut result = HashMap::with_capacity(strs.len());
for word in strs {
let mut characters = HashMap::with_capacity(26);
for c in word.chars() {
let entry = characters.entry(c).or_insert(0);
*entry += 1;
}
let state = WordState { characters };
dbg!(&state);
let entry = result.entry(state).or_insert(vec![]);
entry.push(word);
}
result.into_values().collect()
}
}
// submission codes end
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_49() {
assert_eq!(
WordState {
characters: HashMap::from([('e', 1), ('a', 1), ('t', 1)])
},
WordState {
characters: HashMap::from([('a', 1), ('t', 1), ('e', 1)])
}
);
assert_eq!(
vec![
vec!["bat".to_owned()],
vec!["nat".to_owned(), "tan".to_owned()],
vec!["ate".to_owned(), "eat".to_owned(), "tea".to_owned()]
],
Solution::group_anagrams(vec![
"eat".to_owned(),
"tea".to_owned(),
"tan".to_owned(),
"ate".to_owned(),
"nat".to_owned(),
"bat".to_owned()
])
);
}
}