题目

给定一个字符串，请你找出其中不含有重复字符的 最长子串 的长度。

示例 1:
输入: s = “abcabcbb” 输出: 3 解释: 因为无重复字符的最长子串是 “abc”，所以其长度为 3。
示例 2:
输入: s = “bbbbb” 输出: 1 解释: 因为无重复字符的最长子串是 “b”，所以其长度为 1。
示例 3:
输入: s = “pwwkew” 输出: 3 解释: 因为无重复字符的最长子串是 “wke”，所以其长度为 3。请注意，你的答案必须是子串的长度，”pwke” 是一个子序列，不是子串。
示例 4:
输入: s = “” 输出: 0

提示：

0 <= s.length <= 5 * 104
s 由英文字母、数字、符号和空格组成

解题思路

1、暴力破解法

最容易想到，也最容易实现的方法。

1）遍历所有子串 O(n²)；
2）判断该子串是否没有重复字符。

2、滑动窗口法

滑动窗口算法是在给定特定窗口大小的数组或字符串上执行要求的操作。该可以将一部分问题中的嵌套循环转变为一个单循环，因此它可以减少时间复杂度。（TCP/IP 协议也使用了该算法）

1）准备一个容器，用于存储字符末次出现过的位置（下标）；

该题目指明了字符串由英文字母、数字、符号和空格组成，所以该容器可以用数组代替散列表提高效率。将字符的 ASCII 码作为 int 数组的下标，末次出现的位置作为 value 即可。

2）遍历给定的字符串 s

使用滑动窗口法动态收缩扩张，遍历过程中记录滑动窗口的最大值，遍历结束后即可得到最大子串长度。

PS：
滑动窗口的扩张：
默认滑动窗口的起始位置为 0 ，在遍历过程中，如果当前字符在当前滑动窗口尚未出现过，则计算当前滑动窗口的长度，如果为历史最大值，则记录下来。

滑动窗口的收缩：
在遍历过程中，如果当前字符在当前滑动窗口内出现过（出现过的位置记为X），则将滑动窗口的起始位置移动到 X+1 。

滑动窗口的长度计算：
在遍历过程中，假设 start 为默认窗口的起始下标，将当前 for 循环的 i 作为当前的下标，i - start + 1 即为当前滑动窗口的长度。

答案

1、暴力破解

效率低下，测试用例字符串较长时，时间超限

class Solution {
    public int lengthOfLongestSubstring(String s) {
        // 如果字符串为空
        if (s.length() == 0) {
            return 0;
        }
        // 滑动窗口的起始位置与长度
        int start = 0, length = 1;
        int maxLength = -1;
        // 第一重循环，滑动窗口的起点
        for (start = 0; start < s.length(); start++) {
//            System.out.println("start: " + start);
            // 第二重循环，滑动窗口的大小
            for (length = 1; length < s.length() - start + 1; length++) {
//                System.out.println("length: " + length);
                String temp = s.substring(start, start + length);
//                System.out.println("temp: " + temp);
                // 第三重循环 寻找滑动窗口中的字符是否有重复的
                for (int i = 0; i < temp.length(); i++) {
                    char tempChar = temp.charAt(i);
                    int index = temp.indexOf(tempChar);
//                    System.out.println(temp);
//                    System.out.println(tempChar);
//                    System.out.println(index);
                    if (index < i) {
                        // 当前滑动窗口中字符存在重复的，进入下一个循环
//                        System.out.println("oops! break");
                        break;
                    }
                    if (index != 0 || i == 0) {
                        // 当前字符尚未出现过，如果数组下标比maxLength还要长，则更新maxLength
                        if (maxLength < i) {
                            maxLength = i;
//                            System.out.println("update maxLength: " + maxLength);
                        }
                    }
                }
            }
        }
        return maxLength + 1;
    }
}

2、滑动窗口（最优解）

使用数组代替散列表作为存储字符串末次出现位置的容器，提高效率。

class Solution {
    public int lengthOfLongestSubstring(String s) {
        // 记录字符上一次出现的位置
        int[] last = new int[128];
        for (int i = 0; i < 128; i++) {
            last[i] = -1;
        }
        // 目标字符串总长度
        int n = s.length();
        // 滑动窗口开始位置，滑动窗口长度最大值
        int start = 0, maxlength = 0;
        for (int i = 0; i < n; i++) {
            // 当前字符 ASCII 码
            int code = s.charAt(i);
            start = Math.max(start, last[code] + 1);
            maxlength = Math.max(maxlength, i - start + 1);
            last[code] = i;
//            System.out.println("start：" + start);
//            System.out.println("end/i：" + i);
//            System.out.println("max：" + maxlength);
//            System.out.println(s.substring(start, i + 1));
//            System.out.println("-----------");
        }
        return maxlength;
    }
}

3、滑动窗口（通用版）

使用散列表来存储字符末次出现的位置，可兼容中文和其他不在 ASCII 码内的字符，通用性更强。

import java.util.HashMap;
public class Main {
    public static void main(String[] args) {
//        String test = "";
//        String test = " ";
//        String test = "au";
//        String test = "abcabcbb";
//        String test = "pwwkew";
//        String test = "yydsykihddxginnnbtkuvaewqshceqscryxrkhankxuumjkqcukaxqwniermwlrpjqgtxhjkgfetqqj";
//        String test = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ 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abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ 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abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ 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abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!\\\"#$%&'()*+,-./:;<=>?@[\\\\]^_`{|}~ abcdefghijklmnopqrstuvwxyzABCD";
        String test = "我在这儿在";
        int max = new Solution().lengthOfLongestSubstring(test);
        System.out.println("maxLength: " + max);
    }
}
/**
 * 滑动窗口
 */
class Solution {
    public int lengthOfLongestSubstring(String s) {
        // 记录字符上一次出现的位置
        HashMap<Object, Integer> map = new HashMap<>();
        // 目标字符串总长度
        int n = s.length();
        // 滑动窗口开始位置，滑动窗口长度最大值
        int start = 0, maxlength = 0;
        // [对象复用]当前字符
        char currentChar;
        // [对象复用]当前字符末次出现的数组下标  默认为-1
        int lastIndex;
        for (int i = 0; i < n; i++) {
            // 获取当前字符
            currentChar = s.charAt(i);
            // 设置末次出现数组下标默认值
            lastIndex = -1;
            // 判断当前字符是否存在
            if (map.containsKey(currentChar)) {
                // 存在，当前字符末次出现的数组下标
                lastIndex = map.get(currentChar);
            } else {
                // 不存在
            }
            // 如果当前字符曾经出现过，将末次出现位置的后一位设为滑动窗口的起始位置。
            // 如果没有出现过，则不移动滑动窗口的起始位置
            start = Math.max(start, lastIndex + 1);
            // 获取当前滑动窗口的长度
            int currentLength = i - start + 1;
            // 如果当前滑动窗口长度是最长的，则更新最大值
            maxlength = Math.max(maxlength, currentLength);
            // 更新当前字符末次出现的数组下标
            map.put(currentChar, i);
//            System.out.println("start：" + start);
//            System.out.println("end/i：" + i);
//            System.out.println("max：" + maxlength);
//            System.out.println(s.substring(start, i + 1));
//            System.out.println("-----------");
        }
        return maxlength;
    }
}

Leetcode 算法题专栏（Java）

3. 无重复字符的最长子串（中等）

题目