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){
start = i + 1;
}
}

return list;
}
}```

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