Java实现-单词切分

给出一个字符串s和一个词典，判断字符串s是否可以被空格切分成一个或多个出现在字典中的单词。

您在真实的面试中是否遇到过这个题？ 

Yes

样例

给出

s = "lintcode"

dict = ["lint","code"]

返回 true 因为"lintcode"可以被空格切分成"lint code"

public class Solution {    /**     * @param s: A string s     * @param dict: A dictionary of words dict     */    private int getMaxLength(Set<String> dict) {        int maxLength = 0;        for (String word : dict) {            maxLength = Math.max(maxLength, word.length());        }        return maxLength;    }    public boolean wordBreak(String s, Set<String> dict) {        if (s == null || s.length() == 0) {            return true;        }        int maxLength = getMaxLength(dict);        boolean[] canSegment = new boolean[s.length() + 1];        canSegment[0] = true;        for (int i = 1; i <= s.length(); i++) {            canSegment[i] = false;            for (int lastWordLength = 1;                     lastWordLength <= maxLength && lastWordLength <= i;                     lastWordLength++) {                if (!canSegment[i - lastWordLength]) {                    continue;                }                String word = s.substring(i - lastWordLength, i);                if (dict.contains(word)) {                    canSegment[i] = true;                    break;                }            }        }        return canSegment[s.length()];    }}