51 lines
1.1 KiB
Rust
51 lines
1.1 KiB
Rust
use itertools::Itertools;
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#[cfg(debug_assertions)]
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const INPUT: usize = 10000;
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#[cfg(debug_assertions)]
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const LENGTH: usize = 20;
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#[cfg(not(debug_assertions))]
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const INPUT: usize = 10011111011011001;
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#[cfg(not(debug_assertions))]
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const LENGTH: usize = 272;
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const LENGTH2: usize = 35651584;
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fn main() {
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calculate_checksum(LENGTH);
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calculate_checksum(LENGTH2);
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}
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fn calculate_checksum(length: usize) {
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let mut a = INPUT.to_string();
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while a.len() < length {
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let mut b = a.clone();
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b = b
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.chars()
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.rev()
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.map(|c| if c == '0' { '1' } else { '0' })
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.collect();
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let mut result = a.clone();
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result.push('0');
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result.push_str(&b);
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a = result;
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}
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a.truncate(length);
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loop {
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let possible_checksum: String = a
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.chars()
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.tuples()
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.map(|(c0, c1)| c0 == c1)
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.map(|b| if b { '1' } else { '0' })
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.collect();
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if possible_checksum.len() % 2 == 1 {
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a = possible_checksum;
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break;
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}
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a = possible_checksum;
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}
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println!("{a}");
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}
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