feat(leetcode): add No.3461

Author: mickey0524

3461.Check-If-Digits-Are-Equal-in-String-After-Operations-I.java

@@ -0,0 +1,26 @@
+// https://leetcode.com/problems/check-if-digits-are-equal-in-string-after-operations-i/description/
+// algorithms
+// Easy (79.8%)
+// Total Accepted: 38.7K
+// Total Submissions: 48.5K
+
+
+class Solution {
+
+    public boolean hasSameDigits(String s) {
+        if (s.length() == 2) {
+            return s.charAt(0) == s.charAt(1);
+        }
+
+        StringBuilder sb = new StringBuilder();
+        int len = s.length();
+        for (int i = 0; i < len - 1; i++) {
+            sb.append((s.charAt(i) - '0' + s.charAt(i + 1) - '0') % 10);
+        }
+        
+        return hasSameDigits(sb.toString());
+    }
+
+}
+
+