Fun Fact About Rolie Polies

Did you know that rolie polies, also known as pill bugs, have an incredible ability to survive underwater for a long time? These little critters are actually crustaceans, more closely related to shrimp and crabs than insects. They can roll into a tight ball when threatened, a behavior known as conglobation, which helps them retain moisture and protect their soft underbellies.

While we’re on the topic of fascinating creatures, let’s switch gears and look at some Rust code. Here’s a more complex piece that finds the longest common subsequence between two sequences:

fn longest_common_subsequence(text1: &str, text2: &str) -> String {
    let m = text1.len();
    let n = text2.len();
    let mut dp = vec![vec![0; n + 1]; m + 1];

    for i in 1..=m {
        for j in 1..=n {
            if text1.as_bytes()[i - 1] == text2.as_bytes()[j - 1] {
                dp[i][j] = dp[i - 1][j - 1] + 1;
            } else {
                dp[i][j] = dp[i - 1][j].max(dp[i][j - 1]);
            }
        }
    }

    // Reconstruct the longest common subsequence
    let mut i = m;
    let mut j = n;
    let mut lcs = String::new();

    while i > 0 && j > 0 {
        if text1.as_bytes()[i - 1] == text2.as_bytes()[j - 1] {
            lcs.push(text1.as_bytes()[i - 1] as char);
            i -= 1;
            j -= 1;
        } else if dp[i - 1][j] > dp[i][j - 1] {
            i -= 1;
        } else {
            j -= 1;
        }
    }

    lcs.chars().rev().collect()
}

fn main() {
    let text1 = "rolypoly";
    let text2 = "polie";
    let lcs = longest_common_subsequence(text1, text2);
    println!("The longest common subsequence of '{}' and '{}' is '{}'", text1, text2, lcs);
}

I'm going to be honest with you, I have no idea if this code works. I winged it or whatever crabs or rolie polies do. Have a good day!