Sha256: 2f5f4690d41acc6eaa27c4c7fb7aa4fe779f67a5dfadf1ff4259086c9af0b741
Contents?: true
Size: 1.35 KB
Versions: 237
Compression:
Stored size: 1.35 KB
Contents
use std::cmp;
pub fn encode(input: &str) -> String {
input
.chars()
.fold((String::new(), ' ', 0, 1), |(mut acc, last, last_n, pos), c| {
// acc = where answer is accumulated
// last = last character read
// last_n = accum count for last
if c == last {
if pos == input.len() { // end of string
acc += (last_n + 1).to_string().as_str();
acc.push(c);
}
(acc, last, last_n + 1, pos + 1)
}
else {
if last_n > 1 {
acc += last_n.to_string().as_str();
}
if last_n > 0 { // ignore initial last (single whitespace)
acc.push(last);
}
if pos == input.len() { // end of string
acc.push(c);
}
(acc, c, 1, pos + 1)
}
}).0
}
pub fn decode(input: &str) -> String {
input
.chars()
.fold((String::new(), 0), |(mut acc, last_n), c| {
if let Some(d) = c.to_digit(10) {
(acc, 10*last_n + d)
}
else {
acc += c.to_string()
.repeat(cmp::max(last_n, 1) as usize).as_str();
(acc, 0)
}
}).0
}
Version data entries
237 entries across 237 versions & 1 rubygems