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题目：
题解：
class Solution {public List<String> wordBreak(String s, List<String> wordDict) {Map<Integer, List<List<String>>> map = new HashMap<Integer, List<List<String>>>();List<List<String>> wordBreaks = backtrack(s, s.length(), new HashSet<String>(wordDict), 0, map);List<String> breakList = new LinkedList<String>();for (List<String> wordBreak : wordBreaks) {breakList.add(String.join(" ", wordBreak));}return breakList;}public List<List<String>> backtrack(String s, int length, Set<String> wordSet, int index, Map<Integer, List<List<String>>> map) {if (!map.containsKey(index)) {List<List<String>> wordBreaks = new LinkedList<List<String>>();if (index == length) {wordBreaks.add(new LinkedList<String>());}for (int i = index + 1; i <= length; i++) {String word = s.substring(index, i);if (wordSet.contains(word)) {List<List<String>> nextWordBreaks = backtrack(s, length, wordSet, i, map);for (List<String> nextWordBreak : nextWordBreaks) {LinkedList<String> wordBreak = new LinkedList<String>(nextWordBreak);wordBreak.offerFirst(word);wordBreaks.add(wordBreak);}}}map.put(index, wordBreaks);}return map.get(index);}
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