Create concatenation-of-consecutive-binary-numbers.cpp

Author: kamyu104

C++/concatenation-of-consecutive-binary-numbers.cpp

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+// Time:  O(n)
+// Space: O(1)
+
+class Solution {
+public:
+    int concatenatedBinary(int n) {
+        static int MOD = 1e9 + 7;
+        uint64_t result = 0, len = 0;
+        for (int i = 1; i <= n; ++i) {
+            if ((i & (i - 1)) == 0) {
+                ++len;
+            }
+            result = ((result << len) % MOD + i) % MOD;
+        }
+        return result;
+    }
+};