Package 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 java.lang.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
    Description
    Solution()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    int
    concatenatedBinary(int n)
     

    Methods inherited from class java.lang.Object

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

  • Constructor Details

    • Solution

      public Solution()

  • Method Details

    • concatenatedBinary

      public int concatenatedBinary(int n)