// ---------- begin ModInt ---------- const MOD: u32 = 1_000_000_007; #[derive(Clone, Copy)] struct ModInt(u32); impl std::ops::Add for ModInt { type Output = ModInt; fn add(self, rhs: ModInt) -> Self::Output { let mut d = self.0 + rhs.0; if d >= MOD { d -= MOD; } ModInt(d) } } impl std::ops::AddAssign for ModInt { fn add_assign(&mut self, rhs: ModInt) { *self = *self + rhs; } } impl std::ops::Sub for ModInt { type Output = ModInt; fn sub(self, rhs: ModInt) -> Self::Output { let mut d = self.0 + MOD - rhs.0; if d >= MOD { d -= MOD; } ModInt(d) } } impl std::ops::SubAssign for ModInt { fn sub_assign(&mut self, rhs: ModInt) { *self = *self - rhs; } } impl std::ops::Mul for ModInt { type Output = ModInt; fn mul(self, rhs: ModInt) -> Self::Output { ModInt((self.0 as u64 * rhs.0 as u64 % MOD as u64) as u32) } } impl std::ops::MulAssign for ModInt { fn mul_assign(&mut self, rhs: ModInt) { *self = *self * rhs; } } impl std::ops::Neg for ModInt { type Output = ModInt; fn neg(self) -> Self::Output { ModInt(if self.0 == 0 {0} else {MOD - self.0}) } } impl std::fmt::Display for ModInt { fn fmt<'a>(&self, f: &mut std::fmt::Formatter<'a>) -> std::fmt::Result { write!(f, "{}", self.0) } } impl std::str::FromStr for ModInt { type Err = std::num::ParseIntError; fn from_str(s: &str) -> Result { let val = s.parse::()?; Ok(ModInt::new(val)) } } #[allow(dead_code)] impl ModInt { pub fn new(n: u32) -> ModInt { ModInt(n % MOD) } pub fn zero() -> ModInt { ModInt(0) } pub fn one() -> ModInt { ModInt(1) } pub fn pow(self, mut n: u32) -> ModInt { let mut t = ModInt::one(); let mut s = self; while n > 0 { if n & 1 == 1 { t *= s; } s *= s; n >>= 1; } t } pub fn inv(self) -> ModInt { assert!(self.0 > 0); self.pow(MOD - 2) } } // ---------- end ModInt ---------- use std::io::Read; fn add(bit: &mut [(usize, ModInt)], x: usize, v: (usize, ModInt)) { let mut i = x; while i < bit.len() { if bit[i].0 < v.0 { bit[i] = v; } else if bit[i].0 == v.0 { bit[i].1 += v.1; } i += i & (!i + 1); } } fn sum(bit: &[(usize, ModInt)], x: usize) -> (usize, ModInt) { let mut ans = (0, ModInt::one()); let mut i = x; while i > 0 { if bit[i].0 > ans.0 { ans = bit[i]; } else if bit[i].0 == ans.0 { ans.1 += bit[i].1; } 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![(0, ModInt::zero()); b.len()]; for a in a { let s = sum(&bit, a - 1); add(&mut bit, a, (s.0 + 1, s.1)); } let ans = sum(&bit, b.len() - 1); println!("{}", ans.1); } fn main() { run(); }