Created
October 12, 2015 13:25
-
-
Save sumproxy/4daaf37054985361f9bb to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
```rust | |
use std::collections::HashMap; | |
use std::hash::Hash; | |
struct RangeTuple<T> | |
where T: Hash + Eq { | |
cache: HashMap<(T, T), bool>, | |
first: std::ops::Range<T>, | |
second: std::ops::Range<T>, | |
} | |
impl<T: Hash + Eq> RangeTuple<T> { | |
fn new(f: std::ops::Range<T>, s: std::ops::Range<T>) -> RangeTuple<T> { | |
RangeTuple { first: f, second: s, cache: HashMap::new() } | |
} | |
} | |
impl<T: Hash + Eq> Iterator for RangeTuple<T> { | |
type Item = (T, T); | |
fn next(&mut self) -> Option<(T, T)> { | |
Some((self.first.next(), self.second.next())) | |
} | |
} | |
fn is_palindrome(num: u64) -> bool { | |
let s = num.to_string(); | |
s.chars().zip(s.chars().rev()).all(|(i1, i2)| i1 == i2 ) | |
} | |
fn main() { | |
let mut largest = 0; | |
for i in 100..999 { | |
for j in 100..999 { | |
if is_palindrome(i * j) && ((i * j) > largest) { | |
largest = i * j; | |
println!("Largest: {}, {} x {}", largest, i, j); | |
} | |
} | |
} | |
} | |
``` |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment