Create 205. Isomorphic Strings (#446)

Author: Chayandas07

205. Isomorphic Strings

@@ -0,0 +1,21 @@
+class Solution {
+public:
+    bool isIsomorphic(string s, string t) {
+        vector<int> map1(128, 0);  // Stores frequency of s
+        vector<int> map2(128, 0);  // Stores frequency of t
+
+        for(int i=0; i<s.length(); i++) {
+            char s_ch = s[i];
+            char t_ch = t[i];
+
+            if(map1[s_ch]==0 && map2[t_ch]==0) {
+                map1[s_ch] = t_ch;
+                map2[t_ch] = s_ch;
+            }
+            else if(map1[s_ch] != t_ch || map2[t_ch] != s_ch) {
+                return false;
+            }
+        }
+        return true;
+    }
+};