Leetcode
2020.04.17 13:15

763. Partition Labels

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A string S of lowercase letters is given. We want to partition this string into as many parts as possible so that each letter appears in at most one part, and return a list of integers representing the size of these parts.

Example 1:

Input: S = "ababcbacadefegdehijhklij"
Output: [9,7,8]
Explanation:
The partition is "ababcbaca", "defegde", "hijhklij".
This is a partition so that each letter appears in at most one part.
A partition like "ababcbacadefegde", "hijhklij" is incorrect, because it splits S into less parts.

Note:

  1. S will have length in range [1, 500].
  2. S will consist of lowercase letters ('a' to 'z') only.


class Solution {
    public List<Integer> partitionLabels(String S) {
        Map<Character, Integer> hmap = new HashMap<>();
        for(int i=0; i<S.length(); i++){
            hmap.put(S.charAt(i), i);
        }
        //System.out.println(hmap);
        
        int start = 0;
        int end = 0;
        List<Integer> list = new ArrayList<>();
        for(int i=0; i<S.length(); i++){
            int last = hmap.get(S.charAt(i));
            if(end < last){
                end = last;
            }
            
            if(i == end){
                list.add(end - start + 1);
                start = i + 1;
            }
        }
        
        return list;
    }
}


[문제] https://leetcode.com/problems/partition-labels/



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