Commit 0cfe551

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asxy

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Update 0647.回文子串.md

回文子串添加java动态规划简单版本的代码

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`@@ -267,6 +267,27 @@ class Solution {`
`267`	`267`	`return ans;`
`268`	`268`	`}`
`269`	`269`	`}`
	`270`	`+`
	`271`	+```
	`272`	`+`
	`273`	`+动态规划:简洁版`
	`274`	+```java
	`275`	`+class Solution {`
	`276`	`+ public int countSubstrings(String s) {`
	`277`	`+ boolean[][] dp = new boolean[s.length()][s.length()];`
	`278`	`+`
	`279`	`+ int res = 0;`
	`280`	`+ for (int i = s.length() - 1; i >= 0; i--) {`
	`281`	`+ for (int j = i; j < s.length(); j++) {`
	`282`	`+ if (s.charAt(i) == s.charAt(j) && (j - i <= 1 \|\| dp[i + 1][j - 1])) {`
	`283`	`+ res++;`
	`284`	`+ dp[i][j] = true;`
	`285`	`+ }`
	`286`	`+ }`
	`287`	`+ }`
	`288`	`+ return res;`
	`289`	`+ }`
	`290`	`+}`
`270`	`291`	```
`271`	`292`
`272`	`293`	`中心扩散法:`

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