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Merge pull request youngyangyang04#1643 from zhicheng-lee/zhicheng-lee-patch-11

更新 0139.单词拆分.md Java代码

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- 0139.单词拆分.md

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`‎problems/0139.单词拆分.md‎`

Lines changed: 25 additions & 3 deletions

Original file line number	Diff line number	Diff line change
`@@ -234,11 +234,13 @@ Java:`
`234`	`234`	```java
`235`	`235`	`class Solution {`
`236`	`236`	`public boolean wordBreak(String s, List<String> wordDict) {`
	`237`	`+ HashSet<String> set = new HashSet<>(wordDict);`
`237`	`238`	`boolean[] valid = new boolean[s.length() + 1];`
`238`	`239`	`valid[0] = true;`
	`240`	`+`
`239`	`241`	`for (int i = 1; i <= s.length(); i++) {`
`240`		`- for (int j = 0; j < i; j++) {`
`241`		`- if (wordDict.contains(s.substring(j,i)) && valid[j]) {`
	`242`	`+ for (int j = 0; j < i&&!valid[i]; j++) {`
	`243`	`+ if (set.contains(s.substring(j,i)) && valid[j]) {`
`242`	`244`	`valid[i] = true;`
`243`	`245`	`}`
`244`	`246`	`}`
`@@ -248,6 +250,26 @@ class Solution {`
`248`	`250`	`}`
`249`	`251`	`}`
`250`	`252`
	`253`	`+// 另一种思路的背包算法`
	`254`	`+class Solution {`
	`255`	`+ public boolean wordBreak(String s, List<String> wordDict) {`
	`256`	`+ boolean[] dp = new boolean[s.length() + 1];`
	`257`	`+ dp[0] = true;`
	`258`	`+`
	`259`	`+ for (int i = 1; i <= s.length(); i++) {`
	`260`	`+ for (String word : wordDict) {`
	`261`	`+ int len = word.length();`
	`262`	`+ if (i >= len && dp[i - len] && word.equals(s.substring(i - len, i))) {`
	`263`	`+ dp[i] = true;`
	`264`	`+ break;`
	`265`	`+ }`
	`266`	`+ }`
	`267`	`+ }`
	`268`	`+`
	`269`	`+ return dp[s.length()];`
	`270`	`+ }`
	`271`	`+}`
	`272`	`+`
`251`	`273`	`// 回溯法+记忆化`
`252`	`274`	`class Solution {`
`253`	`275`	`private Set<String> set;`
`@@ -285,7 +307,7 @@ class Solution {`
`285`	`307`
`286`	`308`	`Python:`
`287`	`309`
`288`		-```python3
	`310`	+```python
`289`	`311`	`class Solution:`
`290`	`312`	`def wordBreak(self, s: str, wordDict: List[str]) -> bool:`
`291`	`313`	`'''排列'''`

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`‎problems/0139.单词拆分.md‎`

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