467. Unique Substrings in Wraparound String**
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Consider the string s
to be the infinite wraparound string of "abcdefghijklmnopqrstuvwxyz", so s
will look like this: "...zabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcd....".
Now we have another string p
. Your job is to find out how many unique non-empty substrings of p
are present in s
. In particular, your input is the string p
and you need to output the number of different non-empty substrings of p
in the string s
.
Note: p
consists of only lowercase English letters and the size of p might be over 10000.
Example 1:
Input: "a"Output: 1Explanation: Only the substring "a" of string "a" is in the string s.
Example 2:
Input: "cac"Output: 2Explanation: There are two substrings "a", "c" of string "cac" in the string s.
Example 3:
Input: "zab"Output: 6Explanation: There are six substrings "z", "a", "b", "za", "ab", "zab" of string "zab" in the string s.
Reference
public class Solution { public int findSubstringInWraproundString(String p) { // count[i] is the maximum unique substring end with ith letter. // 0 - 'a', 1 - 'b', ..., 25 - 'z'. int[] count = new int[26]; int maxLengthCur = 0; for (int i = 0; i < p.length(); i++) { int len = 1; if (i > 0 && (p.charAt(i) - p.charAt(i - 1) == 1 || (p.charAt(i - 1) - p.charAt(i) == 25))) maxLengthCur++; else maxLengthCur = 1; int index = p.charAt(i) - 'a'; count[index] = Math.max(count[index], maxLengthCur); } // Sum to get result int sum = 0; for (int i = 0; i < 26; i++) { sum += count[i]; } return sum; }}总结:这道题没有想出来,想到了最长公共子序列,但是情境不同。没有找到子问题。
count[index] = Math.max(count[index], maxLengthCur);保证了以某个字母结尾的子序列数最大。
子序列数实际上和长度有关,多少个长度。
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