diff options
Diffstat (limited to 'other/sort_char_freq.rs')
-rw-r--r-- | other/sort_char_freq.rs | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/other/sort_char_freq.rs b/other/sort_char_freq.rs new file mode 100644 index 0000000..a9d0e13 --- /dev/null +++ b/other/sort_char_freq.rs @@ -0,0 +1,16 @@ +struct Solution; + +impl Solution { + pub fn frequency_sort(s: String) -> String { + let mut map = std::collections::HashMap::with_capacity(26 * 2); + s.chars().for_each(|b| * map.entry(b).or_insert(0) += 1); + let mut v = map.into_iter().map(|(c, n)| (c, n)).collect::<Vec<_>>(); + v.sort_unstable_by_key(|pair| - pair.1); + v.into_iter().flat_map(|(c, n)| vec![c; n as usize]).collect() + } +} + +fn main() { + let s = String::from("tree"); + print!("{}", Solution::frequency_sort(s)); +} |