Create 97. Interleaving String

sumeetskd · Aug 25, 2023 · 4b0224a · 4b0224a
1 parent 61de706
commit 4b0224a
Showing 1 changed file with 27 additions and 0 deletions.
diff --git a/August/97. Interleaving String b/August/97. Interleaving String
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+class Solution {
+    public boolean isInterleave(String s1, String s2, String s3) {
+        if(s1.length()+s2.length()!=s3.length()){
+            return false;
+        }
+        int dp[][] = new int[s1.length()+1][s2.length()+1];
+        for(int i = 0; i<=s1.length(); i++){
+            Arrays.fill(dp[i], -1);
+        }
+        return solve(s1, s2, s3, 0, 0, dp);
+    }
+    public boolean solve(String s1, String s2, String s3, int ind1, int ind2, int[][] dp){
+        if(ind1 + ind2 == s3.length()) return true;
+        if(dp[ind1][ind2] != -1)
+            return dp[ind1][ind2] == 1;
+        boolean ans = false;
+
+        if(ind1 < s1.length() && s1.charAt(ind1) == s3.charAt(ind1 + ind2)){
+            ans |= solve(s1, s2, s3, ind1 + 1, ind2, dp);
+        }
+        if(ind2 < s2.length() && s2.charAt(ind2) == s3.charAt(ind1 + ind2)){
+            ans |= solve(s1, s2, s3, ind1, ind2 + 1, dp);
+        }
+        dp[ind1][ind2] = ans ? 1 : 0;
+        return ans;
+    }
+}