結果

問題 No.90 品物の並び替え
ユーザー Yoshihito
提出日時 2020-08-14 17:24:54
言語 Rust
(1.83.0 + proconio)
結果
AC  
実行時間 2 ms / 5,000 ms
コード長 1,969 bytes
コンパイル時間 12,722 ms
コンパイル使用メモリ 401,900 KB
実行使用メモリ 5,248 KB
最終ジャッジ日時 2024-10-10 12:10:34
合計ジャッジ時間 13,307 ms
ジャッジサーバーID
(参考情報)
judge4 / judge3
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 * 1
other AC * 9
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

use std::cmp;
use std::io::{self, Read};
#[derive(Debug)]
struct Input {
n: usize,
scores: Vec<Vec<i32>>,
}
fn next_token(cin_lock: &mut io::StdinLock) -> String {
cin_lock
.by_ref()
.bytes()
.map(|c| c.unwrap() as char)
.skip_while(|c| c.is_whitespace())
.take_while(|c| !c.is_whitespace())
.collect::<String>()
}
fn read_input(cin_lock: &mut io::StdinLock) -> Input {
let n = next_token(cin_lock).parse().unwrap();
let m = next_token(cin_lock).parse().unwrap();
let mut scores = vec![vec![0; n]; n];
for _ in 0..m {
let lhs: usize = next_token(cin_lock).parse().unwrap();
let rhs: usize = next_token(cin_lock).parse().unwrap();
let score = next_token(cin_lock).parse().unwrap();
scores[lhs][rhs] = score;
}
Input { n, scores }
}
fn solve(input: Input, _cin_lock: &mut io::StdinLock) {
let full_mask = (2 << (input.n - 1)) - 1;
let mut dp = vec![vec![0; input.n]; full_mask + 1];
for state in 0..=full_mask {
for item_no in 0..input.n {
let mask = !(1 << item_no);
let excluded_state = state & mask;
//
for i in 0..input.n {
if excluded_state & (0x01 << i) != 0 {
dp[state][item_no] = cmp::max(dp[state][item_no], dp[excluded_state][i]);
}
}
//
for i in 0..input.n {
if excluded_state & (0x01 << i) != 0 {
dp[state][item_no] += input.scores[i][item_no];
}
}
}
}
let answer = dp[full_mask].iter().map(|x| *x).max().unwrap();
println!("{}", answer);
}
fn main() {
let cin = io::stdin();
let mut cin_lock = cin.lock();
let input = read_input(&mut cin_lock);
solve(input, &mut cin_lock);
}
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