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CHALLENGE 079
Andinus
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Table of Contents
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1. Task 1 - Count Set Bits
.. 1. Perl
1 Task 1 - Count Set Bits
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You are given a positive number $N.
Write a script to count the total numbrer of set bits of the binary
representations of all numbers from 1 to $N and return
`$total_count_set_bit % 1000000007'.
1.1 Perl
────────
• Program: <file:perl/ch-1.pl>
We loop from `1 ... $input', convert each `$num' to binary & count the
set bits & add them to `$set_bits'.
┌────
│ my $input = shift @ARGV;
│
│ my $set_bits;
│ foreach my $num (1 ... $input) {
│ my $binary = sprintf "%b", $num;
│ my $count = $binary =~ tr/1//;
│ $set_bits += $count;
│ }
│ print $set_bits % 1000000007, "\n";
└────
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