g1601_1700.s1680_concatenation_of_consecutive_binary_numbers

Class Solution

java.lang.Object

g1601_1700.s1680_concatenation_of_consecutive_binary_numbers.Solution

public class Solution
extends Object

1680 - Concatenation of Consecutive Binary Numbers.

Medium

Given an integer n, return the decimal value of the binary string formed by concatenating the binary representations of 1 to n in order, modulo 109 + 7.

Example 1:

Input: n = 1

Output: 1

Explanation: “1” in binary corresponds to the decimal value 1.

Example 2:

Input: n = 3

Output: 27

Explanation: In binary, 1, 2, and 3 corresponds to “1”, “10”, and “11”.

After concatenating them, we have “11011”, which corresponds to the decimal value 27.

Example 3:

Input: n = 12

Output: 505379714

Explanation: The concatenation results in “1101110010111011110001001101010111100”.

The decimal value of that is 118505380540.

After modulo 10⁹ + 7, the result is 505379714.

Constraints:

• 1 <= n <= 105

Constructor Summary

Constructors

Constructor and Description
Solution()

Method Summary

Modifier and Type	Method and Description
int	concatenatedBinary(int n)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Solution

public Solution()

Method Detail

concatenatedBinary

public int concatenatedBinary(int n)