結果
問題 | No.16 累乗の加算 |
ユーザー |
![]() |
提出日時 | 2020-03-26 00:06:17 |
言語 | Rust (1.83.0 + proconio) |
結果 |
AC
|
実行時間 | 1 ms / 5,000 ms |
コード長 | 1,889 bytes |
コンパイル時間 | 14,570 ms |
コンパイル使用メモリ | 405,148 KB |
実行使用メモリ | 6,820 KB |
最終ジャッジ日時 | 2025-01-02 00:23:52 |
合計ジャッジ時間 | 15,698 ms |
ジャッジサーバーID (参考情報) |
judge4 / judge3 |
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ファイルパターン | 結果 |
---|---|
other | AC * 14 |
コンパイルメッセージ
warning: trait `IteratorExt` is never used --> src/main.rs:29:7 | 29 | trait IteratorExt: Iterator + Sized { | ^^^^^^^^^^^ | = note: `#[warn(dead_code)]` on by default warning: creating a mutable reference to mutable static is discouraged --> src/main.rs:56:21 | 56 | let m = MAP.as_mut().unwrap(); | ^^^^^^^^^^^^ mutable reference to mutable static | = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2024/static-mut-references.html> = note: mutable references to mutable statics are dangerous; it's undefined behavior if any other pointer to the static is used or if any other reference is created for the static while the mutable reference lives = note: `#[warn(static_mut_refs)]` on by default warning: creating a mutable reference to mutable static is discouraged --> src/main.rs:61:17 | 61 | let m = MAP.as_mut().unwrap(); | ^^^^^^^^^^^^ mutable reference to mutable static | = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2024/static-mut-references.html> = note: mutable references to mutable statics are dangerous; it's undefined behavior if any other pointer to the static is used or if any other reference is created for the static while the mutable reference lives warning: creating a mutable reference to mutable static is discouraged --> src/main.rs:64:25 | 64 | let m = MAP.as_mut().unwrap(); | ^^^^^^^^^^^^ mutable reference to mutable static | = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2024/static-mut-references.html> = note: mutable references to mutable statics are dangerous; it's undefined behavior if any other pointer to the static is used or if any other reference is created for the static while the mutable reference lives warning: creating a mutable reference to mutable sta
ソースコード
#![allow(unused_imports)] #![allow(non_snake_case)] use std::collections::HashMap; #[allow(unused_macros)] macro_rules! read { ([$t:ty] ; $n:expr) => ((0..$n).map(|_| read!([$t])).collect::<Vec<_>>()); ($($t:ty),+ ; $n:expr) => ((0..$n).map(|_| read!($($t),+)).collect::<Vec<_>>()); ([$t:ty]) => (rl().split_whitespace().map(|w| w.parse().unwrap()).collect::<Vec<$t>>()); ($t:ty) => (rl().parse::<$t>().unwrap()); ($($t:ty),*) => {{ let buf = rl(); let mut w = buf.split_whitespace(); ($(w.next().unwrap().parse::<$t>().unwrap()),*) }}; } #[allow(dead_code)] fn rl() -> String { let mut buf = String::new(); std::io::stdin().read_line(&mut buf).unwrap(); buf.trim_end().to_owned() } trait IteratorExt: Iterator + Sized { fn vec(self) -> Vec<Self::Item> { self.collect() } } impl<T: Iterator> IteratorExt for T {} const LAW: u64 = 1_000_003; fn main() { let (x, _n) = read!(u64, usize); let a = read!([u64]); let ans = a .iter() .map(|&e| my_pow(x, e) % LAW) .fold(0, |acc, e| (acc + e) % LAW); println!("{}", ans); } // (x^n) % LAW fn my_pow(x: u64, n: u64) -> u64 { static mut MAP: Option<HashMap<u64, u64>> = None; unsafe { if let None = MAP { MAP = Some(HashMap::new()); let m = MAP.as_mut().unwrap(); m.insert(0, 1); m.insert(1, x); } let m = MAP.as_mut().unwrap(); if let None = m.get(&n) { if n % 2 == 1 { let m = MAP.as_mut().unwrap(); m.insert(n, (x * my_pow(x, n/2).pow(2)) % LAW); } else { let m = MAP.as_mut().unwrap(); m.insert(n, (my_pow(x, n/2).pow(2)) % LAW); } } *m.get(&n).unwrap() } }