結果
問題 | No.1681 +-* |
ユーザー | Strorkis |
提出日時 | 2021-09-18 17:15:18 |
言語 | Rust (1.77.0 + proconio) |
結果 |
AC
|
実行時間 | 37 ms / 2,000 ms |
コード長 | 4,854 bytes |
コンパイル時間 | 12,399 ms |
コンパイル使用メモリ | 386,968 KB |
実行使用メモリ | 6,944 KB |
最終ジャッジ日時 | 2024-06-30 14:49:27 |
合計ジャッジ時間 | 14,839 ms |
ジャッジサーバーID (参考情報) |
judge3 / judge4 |
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テストケース
テストケース表示入力 | 結果 | 実行時間 実行使用メモリ |
---|---|---|
testcase_00 | AC | 1 ms
6,812 KB |
testcase_01 | AC | 1 ms
6,816 KB |
testcase_02 | AC | 1 ms
6,940 KB |
testcase_03 | AC | 1 ms
6,940 KB |
testcase_04 | AC | 1 ms
6,944 KB |
testcase_05 | AC | 33 ms
6,944 KB |
testcase_06 | AC | 33 ms
6,940 KB |
testcase_07 | AC | 33 ms
6,940 KB |
testcase_08 | AC | 36 ms
6,944 KB |
testcase_09 | AC | 36 ms
6,944 KB |
testcase_10 | AC | 37 ms
6,940 KB |
testcase_11 | AC | 36 ms
6,944 KB |
testcase_12 | AC | 36 ms
6,940 KB |
testcase_13 | AC | 18 ms
6,940 KB |
testcase_14 | AC | 36 ms
6,944 KB |
testcase_15 | AC | 1 ms
6,940 KB |
testcase_16 | AC | 1 ms
6,940 KB |
testcase_17 | AC | 36 ms
6,940 KB |
testcase_18 | AC | 36 ms
6,944 KB |
testcase_19 | AC | 36 ms
6,944 KB |
ソースコード
pub mod io { use std::io::{BufRead, ErrorKind}; pub fn scan<R: BufRead>(r: &mut R) -> Vec<u8> { let mut res = Vec::new(); loop { let buf = match r.fill_buf() { Ok(buf) => buf, Err(e) if e.kind() == ErrorKind::Interrupted => continue, Err(e) => panic!("{}", e), }; let (done, used, buf) = { match buf.iter().position(u8::is_ascii_whitespace) { Some(i) => (i > 0 || res.len() > 0, i + 1, &buf[..i]), None => (buf.is_empty(), buf.len(), buf), } }; res.extend_from_slice(buf); r.consume(used); if done { return res; } } } #[macro_export] macro_rules! scan { ($r:expr, [$t:tt; $n:expr]) => { (0..$n).map(|_| scan!($r, $t)).collect::<Vec<_>>() }; ($r:expr, [$t:tt]) => { scan!($r, [$t; scan!($r, usize)]) }; ($r:expr, ($($t:tt),*)) => { ($(scan!($r, $t)),*) }; ($r:expr, Usize1) => { scan!($r, usize) - 1 }; ($r:expr, Bytes) => { io::scan($r) }; ($r:expr, String) => { String::from_utf8(scan!($r, Bytes)).unwrap() }; ($r:expr, $t:ty) => { scan!($r, String).parse::<$t>().unwrap() }; } #[macro_export] macro_rules! input { ($r:expr, $($($v:ident)* : $t:tt),* $(,)?) => { $(let $($v)* = scan!($r, $t);)* }; } } pub mod mod_int { use std::fmt; use std::ops::*; #[derive(Clone, Copy, Debug)] pub struct ModInt(u64); impl ModInt { const MOD: u64 = 1_000_000_007; pub fn new(mut x: u64) -> Self { if x >= Self::MOD { x %= Self::MOD; } Self(x) } pub fn zero() -> Self { Self(0) } pub fn one() -> Self { Self(1) } } impl From<usize> for ModInt { fn from(x: usize) -> Self { Self::new(x as u64) } } impl From<i64> for ModInt { fn from(mut x: i64) -> Self { let m = Self::MOD as i64; if x.abs() >= m { x %= m; } if x < 0 { x += m } Self::new(x as u64) } } impl Add for ModInt { type Output = Self; fn add(self, other: Self) -> Self { let mut x = self.0 + other.0; if x >= Self::MOD { x -= Self::MOD; } Self(x) } } impl AddAssign for ModInt { fn add_assign(&mut self, other: Self) { *self = *self + other; } } impl Sub for ModInt { type Output = Self; fn sub(mut self, other: Self) -> Self { if self.0 < other.0 { self.0 += Self::MOD; } Self(self.0 - other.0) } } impl SubAssign for ModInt { fn sub_assign(&mut self, other: Self) { *self = *self - other; } } impl Mul for ModInt { type Output = Self; fn mul(self, other: Self) -> Self { Self::new(self.0 * other.0) } } impl MulAssign for ModInt { fn mul_assign(&mut self, other: Self) { *self = *self * other; } } impl fmt::Display for ModInt { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { write!(f, "{}", self.0) } } impl ModInt { pub fn pow(mut self, mut n: u64) -> Self { let mut res = Self::one(); while n > 0 { if n & 1 == 1 { res *= self; } self *= self; n >>= 1; } res } pub fn inv(self) -> Self { self.pow(Self::MOD - 2) } } } use mod_int::ModInt; fn run<R: std::io::BufRead, W: std::io::Write>(reader: &mut R, writer: &mut W) { input! { reader, n: usize, a: [u64; n], } let mut ans = ModInt::zero(); let mut prod = ModInt::one(); for (i, a) in a.into_iter().enumerate() { prod = prod * ModInt::new(a); if i + 1 < n { ans += prod * ModInt::new(2) * ModInt::new(3).pow(n.saturating_sub(i + 2) as u64); } else { ans += prod; } } writeln!(writer, "{}", ans).ok(); } fn main() { let (stdin, stdout) = (std::io::stdin(), std::io::stdout()); let ref mut reader = std::io::BufReader::new(stdin.lock()); let ref mut writer = std::io::BufWriter::new(stdout.lock()); run(reader, writer); }