結果
| 問題 |
No.507 ゲーム大会(チーム決め)
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2017-10-13 23:12:57 |
| 言語 | Rust (1.83.0 + proconio) |
| 結果 |
AC
|
| 実行時間 | 25 ms / 3,000 ms |
| コード長 | 3,449 bytes |
| コンパイル時間 | 18,748 ms |
| コンパイル使用メモリ | 390,000 KB |
| 実行使用メモリ | 6,820 KB |
| 最終ジャッジ日時 | 2024-11-17 11:45:57 |
| 合計ジャッジ時間 | 20,820 ms |
|
ジャッジサーバーID (参考情報) |
judge1 / judge4 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 2 |
| other | AC * 19 |
ソースコード
#[allow(unused_imports)]
use std::cmp::{max, min, Ordering};
#[allow(unused_imports)]
use std::collections::{HashMap, HashSet, BTreeSet};
mod util {
use std::io::stdin;
use std::str::FromStr;
use std::fmt::Debug;
#[allow(dead_code)]
pub fn line() -> String {
let mut line: String = String::new();
stdin().read_line(&mut line).unwrap();
line.trim().to_string()
}
#[allow(dead_code)]
pub fn get<T: FromStr>() -> T
where
<T as FromStr>::Err: Debug,
{
let mut line: String = String::new();
stdin().read_line(&mut line).unwrap();
line.trim().parse().unwrap()
}
#[allow(dead_code)]
pub fn gets<T: FromStr>() -> Vec<T>
where
<T as FromStr>::Err: Debug,
{
let mut line: String = String::new();
stdin().read_line(&mut line).unwrap();
line.split_whitespace()
.map(|t| t.parse().unwrap())
.collect()
}
#[allow(dead_code)]
pub fn get2<T: FromStr, U: FromStr>() -> (T, U)
where
<T as FromStr>::Err: Debug,
<U as FromStr>::Err: Debug,
{
let mut line: String = String::new();
stdin().read_line(&mut line).unwrap();
let mut iter = line.split_whitespace();
(
iter.next().unwrap().parse().unwrap(),
iter.next().unwrap().parse().unwrap(),
)
}
#[allow(dead_code)]
pub fn get3<S: FromStr, T: FromStr, U: FromStr>() -> (S, T, U)
where
<S as FromStr>::Err: Debug,
<T as FromStr>::Err: Debug,
<U as FromStr>::Err: Debug,
{
let mut line: String = String::new();
stdin().read_line(&mut line).unwrap();
let mut iter = line.split_whitespace();
(
iter.next().unwrap().parse().unwrap(),
iter.next().unwrap().parse().unwrap(),
iter.next().unwrap().parse().unwrap(),
)
}
}
#[allow(unused_macros)]
macro_rules! debug {
($x: expr) => {
println!("{}: {:?}", stringify!($x), $x)
}
}
fn rank(k: usize, buddy: usize, a: &[usize]) -> usize {
let t = k + buddy;
let mut l = 0;
let mut r = a.len() - 1;
let mut cnt = 0;
let mut skipped = false;
while r > l {
if !skipped && a[l] == buddy {
l += 1;
skipped = true;
continue;
}
if !skipped && a[r] == buddy {
r -= 1;
skipped = true;
continue;
}
if a[l] + a[r] > t {
r -= 1;
l += 1;
cnt += 1;
} else {
l += 1;
}
}
cnt
}
fn bin_search(low: usize, high: usize, a: &[usize], scores: &[usize], k: usize, m: usize) -> i64 {
let mid = (low + high) / 2;
if low == high {
return scores.get(low).cloned().map(|i| i as i64).unwrap_or(-1);
}
match rank(k, scores[mid], a).cmp(&m) {
Ordering::Less => bin_search(low, mid, a, scores, k, m),
Ordering::Equal => bin_search(low, mid, a, scores, k, m),
Ordering::Greater => bin_search(mid + 1, high, a, scores, k, m),
}
}
fn main() {
let (n, m): (usize, usize) = util::get2();
let k: usize = util::get();
let mut a: Vec<usize> = (1..n).map(|_| util::get()).collect();
a.sort();
let mut scores = a.clone();
scores.dedup();
println!("{}", bin_search(0, scores.len(), &a, &scores, k, m - 1));
}