Impl limited Rust solution, minor tweak to C impl

This commit is contained in:
Stephen Seo 2022-01-08 20:36:25 +09:00
parent 3de9ac7cdf
commit c820e20721
4 changed files with 327 additions and 3 deletions

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@ -39,7 +39,7 @@ int main(int argc, char **argv) {
sum += 1.0 / (double)(PGenerator_Next(&state)); sum += 1.0 / (double)(PGenerator_Next(&state));
} }
printf("Resulting sum == %lf, last state is %llu\n", sum, state.current); printf("Resulting sum == %.16lf, last state is %llu\n", sum, state.current);
return 0; return 0;
} }

225
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@ -6,3 +6,4 @@ edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies] [dependencies]
structopt = "0.3"

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@ -1,3 +1,101 @@
fn main() { use structopt::StructOpt;
println!("Hello, world!");
#[derive(StructOpt, Debug, Clone)]
struct Args {
#[structopt(short, long, default_value = "128")]
limit: u64,
}
#[derive(Debug, Clone)]
pub struct PGeneratorState {
current: u64,
}
impl Default for PGeneratorState {
fn default() -> Self {
Self {
current: 0,
}
}
}
impl PGeneratorState {
pub fn new() -> Self {
Self::default()
}
fn is_palindrome(n: u64) -> bool {
// get digit count of n
let mut digits: u64 = 0;
let mut temp: u64 = n;
while temp > 0 {
digits += 1;
temp /= 10;
}
if digits == 0 {
panic!("Invalid state, digits == 0");
}
// get "end" and "start" digits
let mut end: u64 = 0;
let mut start: u64 = digits - 1;
let mut temp2: u64;
let mut temp3: u64;
while end < start {
// get "end" digit
temp = n;
temp2 = 0;
while temp2 < end {
temp /= 10;
temp2 += 1;
}
temp %= 10;
// get "start" digit
temp2 = n;
temp3 = 0;
while temp3 < start {
temp2 /= 10;
temp3 += 1;
}
temp2 %= 10;
if temp != temp2 {
// mismatch, is not a palindrome
return false;
}
// cannot yet prove is palindrome until convergence
end += 1;
start -= 1;
}
// no mismatches, is palindrome
true
}
pub fn next(&mut self) -> u64 {
loop {
self.current += 1;
if Self::is_palindrome(self.current) {
return self.current;
}
}
}
}
fn main() {
let mut args = Args::from_args();
println!("Using limit of \"{}\"", args.limit);
let mut sum: f64 = 0.0;
let mut pgen = PGeneratorState::new();
while args.limit > 0 {
args.limit -= 1;
sum += 1.0 / (pgen.next() as f64);
}
println!("Sum is {}, last palindrome is {}", sum, pgen.current);
} }