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notes/48. 最长不含重复字符的子字符串.md

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+# 48. 最长不含重复字符的子字符串
+
+## 题目描述
+
+输入一个字符串（只包含 a\~z 的字符），求其最长不含重复字符的子字符串的长度。例如对于 arabcacfr，最长不含重复字符的子字符串为 acfr，长度为 4。
+
+## 解题思路
+
+```java
+public int longestSubStringWithoutDuplication(String str) {
+    int curLen = 0;
+    int maxLen = 0;
+    int[] preIndexs = new int[26];
+    Arrays.fill(preIndexs, -1);
+    for (int curI = 0; curI < str.length(); curI++) {
+        int c = str.charAt(curI) - 'a';
+        int preI = preIndexs[c];
+        if (preI == -1 || curI - preI > curLen) {
+            curLen++;
+        } else {
+            maxLen = Math.max(maxLen, curLen);
+            curLen = curI - preI;
+        }
+        preIndexs[c] = curI;
+    }
+    maxLen = Math.max(maxLen, curLen);
+    return maxLen;
+}
+```
+
+
+
+
+
+
+<div align="center"><img width="320px" src="https://cs-notes-1256109796.cos.ap-guangzhou.myqcloud.com/githubio/公众号二维码-1.png"></img></div>