Count Set Bits Problem Statement
Given a positive integer N
, compute the total number of '1's in the binary representation of all numbers from 1 to N. Return this count modulo 1e9+7 because the result can be very large.
Input:
The first line contains an integer T
representing the number of test cases.
Each of the next T
lines contains a single integer N
, the value for each test case.
Output:
For each test case, return an integer denoting the count of set bits from 1 to N
modulo 1e9+7.
Output each result on a new line.
Example:
Input:
2
3
5
Output:
4
7
Explanation:
For N = 3
, the numbers are 1 (0b1), 2 (0b10), and 3 (0b11). Total set bits = 4.
For N = 5
, the numbers are 1 (0b1), 2 (0b10), 3 (0b11), 4 (0b100), 5 (0b101). Total set bits = 7.
Constraints:
1 ≤ T ≤ 100
1 ≤ N ≤ 10^9
- Time limit: 1 second
Note:
Implement the function and return the results, as the output mechanism has been handled.
AnswerBot
1y
The task is to count the total number of '1' in the binary representation of all numbers from 1 to N.
Convert each number from 1 to N into its binary representation
Count the number of '1' bits in each ...read more
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