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extern crate chrono;
use std::collections::LinkedList;
use chrono::NaiveDate;
use chrono::Duration;
pub fn partition(f: &Fn(u32) -> i64, v: &Vec<i64>) -> LinkedList<LinkedList<i64>> {
let mut term: LinkedList<i64> = LinkedList::new();
let mut res: LinkedList<LinkedList<i64>> = LinkedList::new();
let mut n: u32 = 1;
let mut a: i64 = v[0];
for &i in v.iter() {
while i >= a + f(n) {
res.push_back(term);
term = LinkedList::new();
a += f(n);
n += 1;
}
term.push_back(i);
}
res.push_back(term);
res
}
pub fn partition_days(
f: &Fn(u32) -> i64,
days: &Vec<NaiveDate>,
) -> LinkedList<LinkedList<NaiveDate>> {
let day1 = days[0];
let part;
{
let mut v: Vec<i64> = Vec::with_capacity(days.len());
for &d in days.iter() {
v.push((day1 - d).num_days());
}
v.sort_unstable();
v.dedup();
part = partition(f, &v);
}
let res = part.into_iter()
.map(|l| {
l.into_iter()
.map(|d| day1 - Duration::days(d))
.rev()
.collect()
})
.collect();
res
}
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