Merge pull request neetcode-gh#952 from miladra/main

Add 10-Regular-Expression-Matching

README.md

@@ -144,7 +144,7 @@ If you would like to have collaborator permissions on the repo to merge your own
 <sub>[115 - Distinct Subsequences](https://leetcode.com/problems/distinct-subsequences/)</sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>✔️</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>✔️</div></sub> | <sub><div align='center'>✔️</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>✔️</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub>
 <sub>[72 - Edit Distance](https://leetcode.com/problems/edit-distance/)</sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>✔️</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>✔️</div></sub> | <sub><div align='center'>✔️</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>✔️</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub>
 <sub>[312 - Burst Balloons](https://leetcode.com/problems/burst-balloons/)</sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>✔️</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>✔️</div></sub> | <sub><div align='center'>✔️</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>✔️</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub>
-<sub>[10 - Regular Expression Matching](https://leetcode.com/problems/regular-expression-matching/)</sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>✔️</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>✔️</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>✔️</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub>
+<sub>[10 - Regular Expression Matching](https://leetcode.com/problems/regular-expression-matching/)</sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>✔️</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>✔️</div></sub> | <sub><div align='center'>✔️</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>✔️</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub>
 <sub>[53 - Maximum Subarray](https://leetcode.com/problems/maximum-subarray/)</sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>✔️</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>✔️</div></sub> | <sub><div align='center'>✔️</div></sub> | <sub><div align='center'>✔️</div></sub> | <sub><div align='center'>✔️</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>✔️</div></sub>
 <sub>[55 - Jump Game](https://leetcode.com/problems/jump-game/)</sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>✔️</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>✔️</div></sub> | <sub><div align='center'>✔️</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>✔️</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub>
 <sub>[45 - Jump Game II](https://leetcode.com/problems/jump-game-ii/)</sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>✔️</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>✔️</div></sub> | <sub><div align='center'>✔️</div></sub> | <sub><div align='center'>✔️</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>✔️</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub>

java/10-Regular-Expression-Matching.java

@@ -0,0 +1,31 @@
+class Solution {
+
+ public boolean isMatch(String s, String p) {
+
+ boolean[][] cache = new boolean[s.length() + 1][p.length() + 1];
+
+ return dfs(cache , s, p, 0 , 0);
+ }
+
+ private boolean dfs(boolean[][] cache, String s, String p , int i, int j) {
+
+ if(cache[i][j] != false) 
+ return cache[i][j]; 
+
+ if( i >= s.length() && j>= p.length()) 
+ return true;
+
+ if(j >= p.length())
+ return false; 
+
+ boolean match = i < s.length() && (s.charAt(i) == p.charAt(j) || p.charAt(j) == '.');
+
+ if(j + 1 < p.length() && p.charAt(j+1)== '*' ) {
+ cache[i][j] = dfs(cache, s, p, i, j+2) || (match && dfs(cache, s, p, i+1, j));
+ } else {
+ cache[i][j] = match && dfs(cache, s, p, i+1, j+1);
+ }
+
+ return cache[i][j];
+ }
+}