unique-substrings-in-wraparound-string（好）

https://leetcode.com/problems/unique-substrings-in-wraparound-string/

好，我自己做出来的。多总结规律，多思考。

package com.company;

import java.util.HashMap;
import java.util.Map;

class Solution {
    public int findSubstringInWraproundString(String p) {
        Map<Integer, Integer> mp = new HashMap<>();
        int ret = 0;
        int cur = 0;
        char[] array = p.toCharArray();
        if (array.length < 1) {
            return 0;
        }
        for (int i=0; i<26; i++) {
            mp.put(i, 0);
        }

        ret++;
        cur++;
        mp.put(array[0]-‘a‘, 1);
        for (int i=1; i<array.length; i++) {
            if ((array[i]-array[i-1]+26) % 26 == 1)  {
                cur++;
            }
            else {
                cur = 1;
            }

            if (cur > mp.get(array[i]-‘a‘)) {
                ret += cur - mp.get(array[i]-‘a‘);
                mp.put(array[i]-‘a‘, cur);
            }
        }
        return ret;
    }
}

public class Main {

    public static void main(String[] args) throws InterruptedException {

        String p = "zab";

        Solution solution = new Solution();
        int ret  = solution.findSubstringInWraproundString(p);

        // Your Codec object will be instantiated and called as such:
        System.out.printf("ret:%d\n", ret);

        System.out.println();

    }

}