結果

問題 No.1176 少ない質問
ユーザー nebocco
提出日時 2020-08-22 11:58:59
言語 Rust
(1.83.0 + proconio)
結果
AC  
実行時間 1 ms / 1,000 ms
コード長 2,060 bytes
コンパイル時間 13,217 ms
コンパイル使用メモリ 400,116 KB
実行使用メモリ 6,820 KB
最終ジャッジ日時 2024-10-15 06:58:37
合計ジャッジ時間 14,007 ms
ジャッジサーバーID
(参考情報)
judge3 / judge2
このコードへのチャレンジ
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ファイルパターン 結果
other AC * 21
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: value assigned to `ng` is never read
  --> src/main.rs:61:13
   |
61 |     let mut ng = 1;
   |             ^^
   |
   = help: maybe it is overwritten before being read?
   = note: `#[warn(unused_assignments)]` on by default

warning: variable does not need to be mutable
  --> src/main.rs:10:13
   |
10 |           let mut s = {
   |               ----^
   |               |
   |               help: remove this `mut`
...
56 | /     input!{
57 | |         n:u64
58 | |     }
   | |_____- in this macro invocation
   |
   = note: `#[warn(unused_mut)]` on by default
   = note: this warning originates in the macro `input` (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

#![allow(dead_code)]
#![allow(non_snake_case)]
macro_rules! input {
(source = $s:expr, $($r:tt)*) => {
let mut iter = $s.split_whitespace();
input_inner!{iter, $($r)*}
};
($($r:tt)*) => {
let mut s = {
use std::io::Read;
let mut s = String::new();
std::io::stdin().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")
};
}
macro_rules ! min {($ a : expr $ (, ) * ) => {{$ a } } ; ($ a : expr , $ b : expr $ (, ) * ) => {{std :: cmp :: min ($ a , $ b ) } } ; ($ a : expr , $
    ($ rest : expr ) ,+ $ (, ) * ) => {{std :: cmp :: min ($ a , min ! ($ ($ rest ) ,+ ) ) } } ; }
macro_rules ! chmin {($ base : expr , $ ($ cmps : expr ) ,+ $ (, ) * ) => {{let cmp_min = min ! ($ ($ cmps ) ,+ ) ; if $ base > cmp_min {$ base =
    cmp_min ; true } else {false } } } ; }
fn main() {
input!{
n:u64
}
let mut ans = n;
let mut ok = n;
let mut ng = 1;
for i in 2..60 {
ng = 1;
while ok - ng > 1 {
let mid = (ok + ng) / 2;
if mid.pow(i) >= n {
ok = mid;
} else {
ng = mid;
}
}
chmin!(ans, i as u64 * ok);
}
println!("{}", ans);
}
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