solvs isomorphic strings

Author: anishLearnsToCode

Diff for: src/IsomorphicStrings.java

@@ -0,0 +1,23 @@
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+
+public class IsomorphicStrings {
+    public static boolean isIsomorphic(String s, String t) {
+        Set<Character> mappingsTo = new HashSet<>();
+        Map<Character, Character> mappings = new HashMap<>();
+
+        for (int index = 0 ; index < s.length() ; index++) {
+            char a = s.charAt(index);
+            char b = t.charAt(index);
+            if (mappings.getOrDefault(a, b) != b || (!mappings.containsKey(a) && mappingsTo.contains(b))) {
+                return false;
+            }
+            mappings.put(a, b);
+            mappingsTo.add(b);
+        }
+
+        return true;
+    }
+}