add 1680

Author: fishercoder1534

Diff for: src/main/java/com/fishercoder/solutions/_1680.java

@@ -0,0 +1,17 @@
+package com.fishercoder.solutions;
+
+public class _1680 {
+    public static class Solution1 {
+        public int concatenatedBinary(int n) {
+            final int MOD = 1000000007;
+            int result = 0;
+            for (int i = 1; i <= n; i++) {
+                String binary = Integer.toBinaryString(i);
+                for (int j = 0; j < binary.length(); j++) {
+                    result = (result * 2 + (binary.charAt(j) - '0')) % MOD;
+                }
+            }
+            return result;
+        }
+    }
+}