Create 1143-Longest-Common-Subsequence.java

Author: SharmaTushar1

java/1143-Longest-Common-Subsequence.java

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+//memoized version
+
+class Solution {
+    public int longestCommonSubsequence(String text1, String text2) {
+        int[][] dp = new int[text1.length()][text2.length()];
+        return LCS(text1, text2, 0, 0, dp);
+    }
+    
+    public int LCS(String s1, String s2, int i, int j, int[][] dp) {
+        if (i>=s1.length() || j>=s2.length()) return 0;
+        else if (dp[i][j]!=0) return dp[i][j];
+        else if (s1.charAt(i) == s2.charAt(j)) return 1+LCS(s1, s2, i+1, j+1, dp);
+        else{ 
+            dp[i][j] = Math.max(LCS(s1, s2, i+1, j, dp), LCS(s1, s2, i, j+1, dp));
+            return dp[i][j];
+        }
+    }
+    
+}