单词切分

来源：互联网发布：sql sum函数分组求和编辑：程序博客网时间：2024/06/10 13:10

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。
样例
s = "lintcode"
dict = ["lint","code"]

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

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()];    }}

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