leetcode: Add 0049

src/leetcode/0049.group-anagrams/Cargo.toml

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+[package]
+name = "lc-0049-group-anagrams"
+version = "0.1.0"
+edition = "2021"
+publish = false
+
+[dependencies]

src/leetcode/0049.group-anagrams/index.md

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+
+# 
+
+[问题描述](../problems/)

src/leetcode/0049.group-anagrams/src/main.rs

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+// Copyright (c) 2024 Xu Shaohua <[email protected]>. All rights reserved.
+// Use of this source is governed by General Public License that can be found
+// in the LICENSE file.
+
+use std::collections::HashMap;
+
+// HashTable
+// 将每个字符串按升序排序, 作为它的索引.
+pub fn group_anagrams1(strs: Vec<String>) -> Vec<Vec<String>> {
+    debug_assert!(!strs.is_empty());
+
+    let mut map: HashMap<String, Vec<String>> = HashMap::new();
+    for s in strs.into_iter() {
+        // 构造字符串的索引
+        let mut chars_vec: Vec<char> = s.chars().collect();
+        chars_vec.sort_unstable();
+        let index: String = chars_vec.into_iter().collect();
+        // 将 (字符串索引, 字符串) 插入到表哈稀表中.
+        map.entry(index).or_default().push(s);
+    }
+
+    //map.into_values().collect()
+    //map.into_iter().map(|(_index, strs)| strs).collect()
+
+    // 为了测试, 我们对结果进行一下排序.
+    let mut out: Vec<Vec<String>> = map
+        .into_values()
+        .map(|mut strs| {
+            strs.sort_unstable();
+            strs
+        })
+        .collect();
+    out.sort_by_key(|v| v.len());
+    out
+}
+
+pub type SolutionFn = fn(Vec<String>) -> Vec<Vec<String>>;
+
+fn check_solution(func: SolutionFn) {
+    let strs = vec![
+        "eat".to_owned(),
+        "tea".to_owned(),
+        "tan".to_owned(),
+        "ate".to_owned(),
+        "nat".to_owned(),
+        "bat".to_owned(),
+    ];
+    let exp = vec![
+        vec!["bat".to_owned()],
+        vec!["nat".to_owned(), "tan".to_owned()],
+        vec!["ate".to_owned(), "eat".to_owned(), "tea".to_owned()],
+    ];
+    assert_eq!(func(strs), exp);
+
+    let strs = vec!["".to_owned()];
+    let exp = vec![vec!["".to_owned()]];
+    assert_eq!(func(strs), exp);
+
+    let strs = vec!["a".to_owned()];
+    let exp = vec![vec!["a".to_owned()]];
+    assert_eq!(func(strs), exp);
+}
+
+fn main() {
+    check_solution(group_anagrams1);
+}
+
+#[cfg(test)]
+mod tests {
+    use super::{check_solution, group_anagrams1};
+
+    #[test]
+    fn test_group_anagrams1() {
+        check_solution(group_anagrams1);
+    }
+}