use std::io::Read; use std::cmp::Ordering; use std::ops::*; const MOD: u32 = 1_000_000_007; #[derive(Clone, Copy)] struct MaxCnt(usize, u32); impl Add for MaxCnt { type Output = Self; fn add(self, rhs: Self) -> Self::Output { match self.0.cmp(&rhs.0) { Ordering::Less => rhs, Ordering::Greater => self, Ordering::Equal => MaxCnt(self.0, (self.1 + rhs.1) % MOD), } } } fn add(bit: &mut [MaxCnt], x: usize, v: MaxCnt) { let mut i = x; while i < bit.len() { bit[i] = bit[i] + v; i += i & (!i + 1); } } fn sum(bit: &[MaxCnt], x: usize) -> MaxCnt { let mut ans = MaxCnt(0, 1); let mut i = x; while i > 0 { ans = ans + bit[i]; i -= i & (!i + 1); } ans } fn run() { let mut s = String::new(); std::io::stdin().read_to_string(&mut s).unwrap(); let mut it = s.trim().split_whitespace(); let n: usize = it.next().unwrap().parse().unwrap(); let a: Vec = it.map(|s| s.parse().unwrap()).collect(); assert!(a.len() == n); let mut b = a.clone(); b.push(-1_000_000_000 - 1); b.sort(); b.dedup(); let a: Vec = a.into_iter().map(|a| b.binary_search(&a).unwrap()).collect(); let mut bit = vec![MaxCnt(0, 0); b.len()]; for a in a { let s = sum(&bit, a - 1); add(&mut bit, a, MaxCnt(s.0 + 1, s.1)); } let ans = sum(&bit, b.len() - 1).1; println!("{}", ans); } fn main() { run(); }