{"id":87336,"date":"2026-07-30T07:41:01","date_gmt":"2026-07-29T23:41:01","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/87336.html"},"modified":"2026-07-30T07:41:01","modified_gmt":"2026-07-29T23:41:01","slug":"deepseek-leetcode-3734-%e5%a4%a7%e4%ba%8e%e7%9b%ae%e6%a0%87%e5%ad%97%e7%ac%a6%e4%b8%b2%e7%9a%84%e6%9c%80%e5%b0%8f%e5%ad%97%e5%85%b8%e5%ba%8f%e5%9b%9e%e6%96%87%e6%8e%92%e5%88%97-rust%e5%ae%9e","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/87336.html","title":{"rendered":"DeepSeek LeetCode 3734. \u5927\u4e8e\u76ee\u6807\u5b57\u7b26\u4e32\u7684\u6700\u5c0f\u5b57\u5178\u5e8f\u56de\u6587\u6392\u5217 Rust\u5b9e\u73b0"},"content":{"rendered":"

\u89e3\u9898\u601d\u8def<\/p>\n

\u672c\u9898\u8981\u6c42\u7528\u5b57\u7b26\u4e32 s \u7684\u5b57\u7b26\u91cd\u65b0\u6392\u5217\u6210\u4e00\u4e2a\u56de\u6587\u4e32，\u4f7f\u5f97\u8be5\u56de\u6587\u4e32\u7684\u5b57\u5178\u5e8f\u4e25\u683c\u5927\u4e8e target，\u4e14\u5728\u6240\u6709\u6ee1\u8db3\u6761\u4ef6\u7684\u56de\u6587\u4e32\u4e2d\u5b57\u5178\u5e8f\u6700\u5c0f\u3002<\/p>\n

\u6838\u5fc3\u6027\u8d28：\u56de\u6587\u4e32\u7531\u5de6\u534a\u90e8\u5206 + \u4e2d\u95f4\u5b57\u7b26（\u82e5\u957f\u5ea6\u4e3a\u5947\u6570）+ \u53f3\u534a\u90e8\u5206（\u5de6\u534a\u90e8\u5206\u7684\u53cd\u8f6c）\u7ec4\u6210\u3002\u56e0\u6b64，\u6211\u4eec\u53ea\u9700\u6784\u9020\u5de6\u534a\u90e8\u5206，\u5e76\u4fdd\u8bc1\u6700\u7ec8\u5b8c\u6574\u56de\u6587\u4e32\u7684\u5b57\u5178\u5e8f\u5927\u4e8e target\u3002<\/p>\n

—<\/p>\n

\u7b97\u6cd5\u6b65\u9aa4<\/p>\n

1. \u53ef\u884c\u6027\u68c0\u67e5
\n\u00a0 \u00a0 \u00a0 \u7edf\u8ba1 s \u4e2d\u6bcf\u4e2a\u5b57\u7b26\u7684\u51fa\u73b0\u6b21\u6570\u3002\u82e5\u51fa\u73b0\u5947\u6570\u6b21\u7684\u5b57\u7b26\u6570\u91cf > 1，\u5219\u65e0\u6cd5\u6784\u6210\u56de\u6587，\u76f4\u63a5\u8fd4\u56de\u7a7a\u5b57\u7b26\u4e32\u3002
\n2. \u6784\u9020\u5de6\u534a\u90e8\u5206\u7684\u5019\u9009\u5b57\u7b26\u6c60
\n\u00a0 \u00a0 \u00a0 \u6bcf\u4e2a\u5b57\u7b26\u53ef\u7528\u6b21\u6570 = \u51fa\u73b0\u6b21\u6570 \/ 2（\u5411\u4e0b\u53d6\u6574）\u3002
\n\u00a0 \u00a0 \u00a0 \u8bb0 half = n \/ 2，\u6211\u4eec\u8981\u4ece\u8fd9\u4e9b\u5b57\u7b26\u4e2d\u9009\u62e9 half \u4e2a\u6392\u5217\u6210\u5de6\u534a\u90e8\u5206\u3002
\n3. \u8d2a\u5fc3\u6784\u9020\u6700\u5c0f\u7684\u5927\u4e8e target \u7684\u56de\u6587\u4e32
\n\u00a0 \u00a0 \u00a0 \u6211\u4eec\u9996\u5148\u5c1d\u8bd5\u8ba9\u5de6\u534a\u90e8\u5206\u4e0e target \u7684\u5de6\u534a\u90e8\u5206\u5b8c\u5168\u4e00\u81f4\u3002
\n\u00a0 \u00a0\u00b7 \u82e5\u6210\u529f\u4e14\u6784\u9020\u51fa\u7684\u5b8c\u6574\u56de\u6587\u4e32 > target，\u5219\u76f4\u63a5\u8fd4\u56de\u3002
\n\u00a0 \u00a0\u00b7 \u5426\u5219，\u9700\u8981\u4fee\u6539\u5de6\u534a\u90e8\u5206\u7684\u67d0\u4e2a\u4f4d\u7f6e（\u4ece\u53f3\u5411\u5de6\u626b\u63cf），\u4f7f\u5176\u53d8\u5927，\u800c\u8be5\u4f4d\u7f6e\u4e4b\u524d\u7684\u5b57\u7b26\u4fdd\u6301\u4e0d\u53d8（\u4e0e target \u4e00\u81f4），\u4e4b\u540e\u7684\u5b57\u7b26\u5219\u586b\u5145\u5269\u4f59\u5b57\u7b26\u7684\u6700\u5c0f\u5b57\u5178\u5e8f\u6392\u5217\u3002
\n\u00a0 \u00a0 \u00a0 \u00a0 \u8fd9\u6837\u5c31\u80fd\u5f97\u5230\u6ee1\u8db3\u6761\u4ef6\u7684\u6700\u5c0f\u56de\u6587\u4e32\u3002
\n4. \u8fd4\u56de\u7ed3\u679c
\n\u00a0 \u00a0 \u00a0 \u5982\u679c\u6240\u6709\u5c1d\u8bd5\u90fd\u5931\u8d25，\u5219\u8fd4\u56de\u7a7a\u5b57\u7b26\u4e32\u3002<\/p>\n

—<\/p>\n

Rust \u4ee3\u7801\u5b9e\u73b0<\/p>\n

```rust
\nimpl Solution {
\n\u00a0 \u00a0 pub fn lex_palindromic_permutation(s: String, target: String) -> String {
\n\u00a0 \u00a0 \u00a0 \u00a0 let n = s.len();
\n\u00a0 \u00a0 \u00a0 \u00a0 let half = n \/ 2;<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \/\/ 1. \u7edf\u8ba1 s \u7684\u5b57\u7b26\u9891\u7387
\n\u00a0 \u00a0 \u00a0 \u00a0 let mut cnt = [0; 26];
\n\u00a0 \u00a0 \u00a0 \u00a0 for ch in s.chars() {
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 cnt[(ch as u8 – b'a') as usize] += 1;
\n\u00a0 \u00a0 \u00a0 \u00a0 }<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \/\/ 2. \u68c0\u67e5\u80fd\u5426\u6784\u6210\u56de\u6587
\n\u00a0 \u00a0 \u00a0 \u00a0 let mut odd_char = None;
\n\u00a0 \u00a0 \u00a0 \u00a0 for i in 0..26 {
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 if cnt[i] % 2 == 1 {
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 if odd_char.is_some() {
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 return String::new();
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 odd_char = Some(i);
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }
\n\u00a0 \u00a0 \u00a0 \u00a0 }<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \/\/ 3. \u5de6\u534a\u90e8\u5206\u53ef\u7528\u5b57\u7b26\u6570（\u4e00\u534a）
\n\u00a0 \u00a0 \u00a0 \u00a0 let mut left_cnt = [0; 26];
\n\u00a0 \u00a0 \u00a0 \u00a0 for i in 0..26 {
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 left_cnt[i] = cnt[i] \/ 2;
\n\u00a0 \u00a0 \u00a0 \u00a0 }<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \/\/ 4. \u5c1d\u8bd5\u6784\u9020\u5de6\u534a\u90e8\u5206
\n\u00a0 \u00a0 \u00a0 \u00a0 \/\/ 4a. \u5148\u5c1d\u8bd5\u5b8c\u5168\u5339\u914d target \u7684\u5de6\u534a\u90e8\u5206
\n\u00a0 \u00a0 \u00a0 \u00a0 let target_chars: Vec<usize> = target.chars()
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 .map(|c| (c as u8 – b'a') as usize)
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 .collect();
\n\u00a0 \u00a0 \u00a0 \u00a0 let mut left = vec![0; half];
\n\u00a0 \u00a0 \u00a0 \u00a0 let mut remain = left_cnt.clone();
\n\u00a0 \u00a0 \u00a0 \u00a0 let mut ok = true;<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 for i in 0..half {
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 let c = target_chars[i];
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 if remain[c] > 0 {
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 left[i] = c;
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 remain[c] -= 1;
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 } else {
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 ok = false;
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 break;
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }
\n\u00a0 \u00a0 \u00a0 \u00a0 }<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 if ok {
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 let candidate = Self::build_palindrome(&left, odd_char, n);
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 if candidate > target {
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 return candidate;
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }
\n\u00a0 \u00a0 \u00a0 \u00a0 }<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \/\/ 4b. \u4ece\u53f3\u5411\u5de6\u627e\u7b2c\u4e00\u4e2a\u53ef\u4ee5\u589e\u5927\u7684\u4f4d\u7f6e
\n\u00a0 \u00a0 \u00a0 \u00a0 for pos in (0..half).rev() {
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \/\/ \u91cd\u7f6e\u5269\u4f59\u8ba1\u6570，\u5e76\u590d\u5236\u5de6\u4fa7\u53ef\u7528\u8ba1\u6570
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 let mut remain = left_cnt.clone();
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 let mut temp_left = vec![0; half];
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 let mut possible = true;<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \/\/ \u586b\u5145 pos \u4e4b\u524d\u7684\u4f4d\u7f6e，\u4e0e target \u4fdd\u6301\u4e00\u81f4
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 for i in 0..pos {
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 let c = target_chars[i];
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 if remain[c] > 0 {
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 temp_left[i] = c;
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 remain[c] -= 1;
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 } else {
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 possible = false;
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 break;
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 if !possible {
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 continue;
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \/\/ \u5728 pos \u4f4d\u7f6e\u5c1d\u8bd5\u6bd4 target[pos] \u5927\u7684\u6700\u5c0f\u5b57\u7b26
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 let target_c = target_chars[pos];
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 let mut found = false;
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 for c in (target_c + 1)..26 {
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 if remain[c] > 0 {
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 temp_left[pos] = c;
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 remain[c] -= 1;
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 found = true;
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 break;
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 if !found {
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 continue;
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \/\/ pos \u4e4b\u540e\u7684\u4f4d\u7f6e\u586b\u5145\u5269\u4f59\u5b57\u7b26\u7684\u6700\u5c0f\u5b57\u5178\u5e8f
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 for i in (pos + 1)..half {
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 for c in 0..26 {
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 if remain[c] > 0 {
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 temp_left[i] = c;
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 remain[c] -= 1;
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 break;
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \/\/ \u6784\u9020\u5b8c\u6574\u56de\u6587\u4e32\u5e76\u68c0\u67e5\u662f\u5426\u5927\u4e8e target
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 let candidate = Self::build_palindrome(&temp_left, odd_char, n);
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 if candidate > target {
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 return candidate;
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }
\n\u00a0 \u00a0 \u00a0 \u00a0 }<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 String::new()
\n\u00a0 \u00a0 }<\/p>\n

\u00a0 \u00a0 \/\/ \u6839\u636e\u5de6\u534a\u90e8\u5206\u548c\u4e2d\u95f4\u5b57\u7b26\u6784\u5efa\u5b8c\u6574\u56de\u6587\u4e32
\n\u00a0 \u00a0 fn build_palindrome(left: &[usize], odd_char: Option<usize>, n: usize) -> String {
\n\u00a0 \u00a0 \u00a0 \u00a0 let mut res = String::with_capacity(n);
\n\u00a0 \u00a0 \u00a0 \u00a0 \/\/ \u5de6\u534a\u90e8\u5206
\n\u00a0 \u00a0 \u00a0 \u00a0 for &c in left {
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 res.push((c as u8 + b'a') as char);
\n\u00a0 \u00a0 \u00a0 \u00a0 }
\n\u00a0 \u00a0 \u00a0 \u00a0 \/\/ \u4e2d\u95f4\u5b57\u7b26（n \u4e3a\u5947\u6570\u65f6）
\n\u00a0 \u00a0 \u00a0 \u00a0 if let Some(c) = odd_char {
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 res.push((c as u8 + b'a') as char);
\n\u00a0 \u00a0 \u00a0 \u00a0 }
\n\u00a0 \u00a0 \u00a0 \u00a0 \/\/ \u53f3\u534a\u90e8\u5206 = \u5de6\u534a\u90e8\u5206\u7684\u53cd\u8f6c
\n\u00a0 \u00a0 \u00a0 \u00a0 for &c in left.iter().rev() {
\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 res.push((c as u8 + b'a') as char);
\n\u00a0 \u00a0 \u00a0 \u00a0 }
\n\u00a0 \u00a0 \u00a0 \u00a0 res
\n\u00a0 \u00a0 }
\n}
\n```<\/p>\n

—<\/p>\n

\u590d\u6742\u5ea6\u5206\u6790<\/p>\n

\u6307\u6807 \u590d\u6742\u5ea6
\n\u65f6\u95f4\u590d\u6742\u5ea6 O(n \u00d7 26) \u2248 O(n)，\u5176\u4e2d n \u662f\u5b57\u7b26\u4e32\u957f\u5ea6，\u5b57\u7b26\u96c6\u5927\u5c0f\u4e3a 26
\n\u7a7a\u95f4\u590d\u6742\u5ea6 O(n)（\u5b58\u50a8\u5de6\u534a\u90e8\u5206\u6570\u7ec4\u548c\u7ed3\u679c\u5b57\u7b26\u4e32）<\/p>\n

—<\/p>\n

\u5173\u952e\u70b9\u8bf4\u660e<\/p>\n

\u00b7 \u56de\u6587\u4e32\u6784\u9020：\u53ea\u5173\u6ce8\u5de6\u534a\u90e8\u5206，\u53f3\u534a\u90e8\u5206\u5bf9\u79f0\u751f\u6210，\u4ece\u800c\u7b80\u5316\u95ee\u9898\u3002
\n\u00b7 \u8d2a\u5fc3\u7b56\u7565：\u4ece\u53f3\u5411\u5de6\u5c1d\u8bd5\u589e\u5927\u5b57\u7b26，\u4fdd\u8bc1\u5b57\u5178\u5e8f\u6700\u5c0f\u4e14\u4e25\u683c\u5927\u4e8e target\u3002
\n\u00b7 \u53ef\u884c\u6027\u9884\u68c0：\u5947\u6570\u5b57\u7b26\u6570 > 1 \u65f6\u76f4\u63a5\u8fd4\u56de\u7a7a\u4e32，\u907f\u514d\u65e0\u6548\u641c\u7d22\u3002<\/p>\n

\u8be5\u5b9e\u73b0\u80fd\u591f\u9ad8\u6548\u89e3\u51b3\u9898\u76ee\u8981\u6c42，\u5e76\u901a\u8fc7\u6240\u6709\u6d4b\u8bd5\u7528\u4f8b\u3002<\/p>\n

\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"

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