Impl limited Rust solution, minor tweak to C impl
This commit is contained in:
parent
3de9ac7cdf
commit
c820e20721
|
|
@ -39,7 +39,7 @@ int main(int argc, char **argv) {
|
|||
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;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -0,0 +1,225 @@
|
|||
# This file is automatically @generated by Cargo.
|
||||
# It is not intended for manual editing.
|
||||
version = 3
|
||||
|
||||
[[package]]
|
||||
name = "ansi_term"
|
||||
version = "0.12.1"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "d52a9bb7ec0cf484c551830a7ce27bd20d67eac647e1befb56b0be4ee39a55d2"
|
||||
dependencies = [
|
||||
"winapi",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "atty"
|
||||
version = "0.2.14"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "d9b39be18770d11421cdb1b9947a45dd3f37e93092cbf377614828a319d5fee8"
|
||||
dependencies = [
|
||||
"hermit-abi",
|
||||
"libc",
|
||||
"winapi",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "bitflags"
|
||||
version = "1.3.2"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
|
||||
|
||||
[[package]]
|
||||
name = "clap"
|
||||
version = "2.34.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "a0610544180c38b88101fecf2dd634b174a62eef6946f84dfc6a7127512b381c"
|
||||
dependencies = [
|
||||
"ansi_term",
|
||||
"atty",
|
||||
"bitflags",
|
||||
"strsim",
|
||||
"textwrap",
|
||||
"unicode-width",
|
||||
"vec_map",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "heck"
|
||||
version = "0.3.3"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "6d621efb26863f0e9924c6ac577e8275e5e6b77455db64ffa6c65c904e9e132c"
|
||||
dependencies = [
|
||||
"unicode-segmentation",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "hermit-abi"
|
||||
version = "0.1.19"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "62b467343b94ba476dcb2500d242dadbb39557df889310ac77c5d99100aaac33"
|
||||
dependencies = [
|
||||
"libc",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "lazy_static"
|
||||
version = "1.4.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
|
||||
|
||||
[[package]]
|
||||
name = "libc"
|
||||
version = "0.2.112"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "1b03d17f364a3a042d5e5d46b053bbbf82c92c9430c592dd4c064dc6ee997125"
|
||||
|
||||
[[package]]
|
||||
name = "proc-macro-error"
|
||||
version = "1.0.4"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "da25490ff9892aab3fcf7c36f08cfb902dd3e71ca0f9f9517bea02a73a5ce38c"
|
||||
dependencies = [
|
||||
"proc-macro-error-attr",
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
"syn",
|
||||
"version_check",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "proc-macro-error-attr"
|
||||
version = "1.0.4"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "a1be40180e52ecc98ad80b184934baf3d0d29f979574e439af5a55274b35f869"
|
||||
dependencies = [
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
"version_check",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "proc-macro2"
|
||||
version = "1.0.36"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "c7342d5883fbccae1cc37a2353b09c87c9b0f3afd73f5fb9bba687a1f733b029"
|
||||
dependencies = [
|
||||
"unicode-xid",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "quote"
|
||||
version = "1.0.14"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "47aa80447ce4daf1717500037052af176af5d38cc3e571d9ec1c7353fc10c87d"
|
||||
dependencies = [
|
||||
"proc-macro2",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "reciprocal_of_palindromes"
|
||||
version = "0.1.0"
|
||||
dependencies = [
|
||||
"structopt",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "strsim"
|
||||
version = "0.8.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
|
||||
|
||||
[[package]]
|
||||
name = "structopt"
|
||||
version = "0.3.25"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "40b9788f4202aa75c240ecc9c15c65185e6a39ccdeb0fd5d008b98825464c87c"
|
||||
dependencies = [
|
||||
"clap",
|
||||
"lazy_static",
|
||||
"structopt-derive",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "structopt-derive"
|
||||
version = "0.4.18"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "dcb5ae327f9cc13b68763b5749770cb9e048a99bd9dfdfa58d0cf05d5f64afe0"
|
||||
dependencies = [
|
||||
"heck",
|
||||
"proc-macro-error",
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
"syn",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "syn"
|
||||
version = "1.0.85"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "a684ac3dcd8913827e18cd09a68384ee66c1de24157e3c556c9ab16d85695fb7"
|
||||
dependencies = [
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
"unicode-xid",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "textwrap"
|
||||
version = "0.11.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "d326610f408c7a4eb6f51c37c330e496b08506c9457c9d34287ecc38809fb060"
|
||||
dependencies = [
|
||||
"unicode-width",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "unicode-segmentation"
|
||||
version = "1.8.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "8895849a949e7845e06bd6dc1aa51731a103c42707010a5b591c0038fb73385b"
|
||||
|
||||
[[package]]
|
||||
name = "unicode-width"
|
||||
version = "0.1.9"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "3ed742d4ea2bd1176e236172c8429aaf54486e7ac098db29ffe6529e0ce50973"
|
||||
|
||||
[[package]]
|
||||
name = "unicode-xid"
|
||||
version = "0.2.2"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "8ccb82d61f80a663efe1f787a51b16b5a51e3314d6ac365b08639f52387b33f3"
|
||||
|
||||
[[package]]
|
||||
name = "vec_map"
|
||||
version = "0.8.2"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "f1bddf1187be692e79c5ffeab891132dfb0f236ed36a43c7ed39f1165ee20191"
|
||||
|
||||
[[package]]
|
||||
name = "version_check"
|
||||
version = "0.9.4"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
|
||||
|
||||
[[package]]
|
||||
name = "winapi"
|
||||
version = "0.3.9"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
|
||||
dependencies = [
|
||||
"winapi-i686-pc-windows-gnu",
|
||||
"winapi-x86_64-pc-windows-gnu",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "winapi-i686-pc-windows-gnu"
|
||||
version = "0.4.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
|
||||
|
||||
[[package]]
|
||||
name = "winapi-x86_64-pc-windows-gnu"
|
||||
version = "0.4.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
|
||||
|
|
@ -6,3 +6,4 @@ edition = "2021"
|
|||
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
|
||||
|
||||
[dependencies]
|
||||
structopt = "0.3"
|
||||
|
|
|
|||
|
|
@ -1,3 +1,101 @@
|
|||
fn main() {
|
||||
println!("Hello, world!");
|
||||
use structopt::StructOpt;
|
||||
|
||||
#[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);
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue