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28 lines
629 B
28 lines
629 B
package class03;
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// 本题测试链接 : https://leetcode.com/problems/longest-substring-without-repeating-characters/
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public class Code01_LongestSubstringWithoutRepeatingCharacters {
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public static int lengthOfLongestSubstring(String s) {
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if (s == null || s.equals("")) {
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return 0;
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}
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char[] str = s.toCharArray();
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int[] map = new int[256];
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for (int i = 0; i < 256; i++) {
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map[i] = -1;
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}
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map[str[0]] = 0;
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int N = str.length;
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int ans = 1;
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int pre = 1;
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for (int i = 1; i < N; i++) {
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pre = Math.min(i - map[str[i]], pre + 1);
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ans = Math.max(ans, pre);
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map[str[i]] = i;
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}
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return ans;
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}
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}
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