結果

問題 No.500 階乗電卓
ユーザー MasuqaTMasuqaT
提出日時 2019-05-17 23:16:55
言語 Rust
(1.83.0 + proconio)
結果
AC  
実行時間 1 ms / 2,000 ms
コード長 4,630 bytes
コンパイル時間 12,547 ms
コンパイル使用メモリ 402,024 KB
実行使用メモリ 6,948 KB
最終ジャッジ日時 2024-09-17 06:02:50
合計ジャッジ時間 13,911 ms
ジャッジサーバーID
(参考情報)
judge6 / judge2
このコードへのチャレンジ
(要ログイン)
ファイルパターン 結果
sample AC * 3
other AC * 20
権限があれば一括ダウンロードができます
コンパイルメッセージ
warning: unused `Result` that must be used
   --> src/main.rs:154:9
    |
154 |         write!(writer, "000000000000");
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: this `Result` may be an `Err` variant, which should be handled
    = note: `#[warn(unused_must_use)]` on by default
    = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)

warning: unused `Result` that must be used
   --> src/main.rs:172:9
    |
172 |         write!(writer, "{}", &s[s.len() - 12..s.len()]);
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: this `Result` may be an `Err` variant, which should be handled
    = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)

warning: unused `Result` that must be used
   --> src/main.rs:175:5
    |
175 |     write!(writer, "{}", product);
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: this `Result` may be an `Err` variant, which should be handled
    = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)

ソースコード

diff #
プレゼンテーションモードにする

use std::io;
use std::io::{BufRead, Write};
use std::ops::{Rem, Div, Mul};
use std::string::ToString;
macro_rules! input {
(source = $s:expr, $($r:tt)*) => {
let mut iter = $s.split_whitespace();
input_inner!{iter, $($r)*}
};
(stdin = $s:expr, $($r:tt)*) => {
let s = {
let mut s = String::new();
$s.read_to_string(&mut s).unwrap();
s
};
let mut iter = s.split_whitespace();
input_inner!{iter, $($r)*}
};
}
macro_rules! input_inner {
($iter:expr) => {};
($iter:expr, ) => {};
($iter:expr, $var:ident : $t:tt $($r:tt)*) => {
let $var = read_value!($iter, $t);
input_inner!{$iter $($r)*}
};
}
macro_rules! read_value {
($iter:expr, ( $($t:tt),* )) => {
( $(read_value!($iter, $t)),* )
};
($iter:expr, [ $t:tt ; $len:expr ]) => {
(0..$len).map(|_| read_value!($iter, $t)).collect::<Vec<_>>()
};
($iter:expr, chars) => {
read_value!($iter, String).chars().collect::<Vec<char>>()
};
($iter:expr, usize1) => {
read_value!($iter, usize) - 1
};
($iter:expr, $t:ty) => {
$iter.next().unwrap().parse::<$t>().expect("Parse error")
};
}
#[allow(unused_macros)]
macro_rules! assert_judge {
($method:ident, $input:expr, $expected:expr) => {
{
let input = $input.as_bytes();
let mut output = Vec::new();
$method(&input[..], &mut output);
let output = String::from_utf8(output).expect("Not UTF-8");
assert_eq!($expected, output);
}
};
}
#[allow(unused_macros)]
macro_rules! assert_judge_with_output {
($method:ident, $input:expr) => {
{
let input = $input.as_bytes();
let mut output = Vec::new();
$method(&input[..], &mut output);
String::from_utf8(output).expect("Not UTF-8")
}
};
}
#[allow(unused_macros)]
macro_rules! assert_eq_with_error {
($left:expr, $right:expr, $precision:expr) => ({
match (&$left, &$right, &$precision) {
(left_val, right_val, precision_val) => {
if !(*left_val - *precision_val < *right_val && *right_val < *left_val + *precision_val) {
// The reborrows below are intentional. Without them, the stack slot for the
// borrow is initialized even before the values are compared, leading to a
// noticeable slow down.
panic!(r#"assertion failed: `(left == right) +- precision`
left: `{:?}`,
right: `{:?}`,
precision: `{:?}`"#, &*left_val, &*right_val, &*precision_val)
}
}
}
});
}
trait GenericInteger: Copy + PartialEq + Rem<Output=Self> + Div<Output=Self> + Mul<Output=Self> {
fn zero() -> Self;
}
macro_rules! dec_gi {
() => {};
($t:ty $(, $r:ty)*) => {
impl GenericInteger for $t {
fn zero() -> Self { 0 }
}
dec_gi![ $( $r ),* ];
};
}
dec_gi![u8, u16, u32, u64, u128, usize, i8, i16, i32, i64, i128, isize];
#[allow(dead_code)]
fn gcd<T>(a: T, b: T) -> T where T: GenericInteger {
if b == T::zero() {
a
} else {
gcd(b, a % b)
}
}
#[allow(dead_code)]
fn lcm<T>(a: T, b: T) -> T where T: GenericInteger {
a / gcd(a, b) * b
}
fn main() {
let stdio = io::stdin();
let input = stdio.lock();
let output = io::stdout();
process(input, output);
}
fn process<R, W>(mut reader: R, mut writer: W) -> () where
R: BufRead,
W: Write {
input! {
stdin = reader,
n: u64
}
// 5/10 -> +'0'
if n >= 60 {
write!(writer, "000000000000");
return;
}
const _10_13: u64 = 1000000000000;
let mut product = 1_u64;
let mut reaches_limit = false;
for i in 2..=n {
product *= i;
if !reaches_limit && product / _10_13 > 0 {
reaches_limit = true;
}
product %= _10_13;
}
if reaches_limit {
let s = { product + _10_13 }.to_string();
write!(writer, "{}", &s[s.len() - 12..s.len()]);
return;
}
write!(writer, "{}", product);
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn sample1() {
assert_judge!(process, "4", "24");
}
#[test]
fn sample2() {
assert_judge!(process, "12", "479001600");
}
#[test]
fn sample3() {
assert_judge!(process, "24", "239439360000");
}
#[test]
fn test7() {
assert_judge!(process, "20", "008176640000");
}
}
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