結果
問題 | No.2509 Beam Shateki |
ユーザー | haihamabossu |
提出日時 | 2023-10-20 22:17:42 |
言語 | Rust (1.83.0 + proconio) |
結果 |
AC
|
実行時間 | 1,177 ms / 2,000 ms |
コード長 | 3,686 bytes |
コンパイル時間 | 14,270 ms |
コンパイル使用メモリ | 395,304 KB |
実行使用メモリ | 6,944 KB |
最終ジャッジ日時 | 2024-09-20 19:36:09 |
合計ジャッジ時間 | 46,168 ms |
ジャッジサーバーID (参考情報) |
judge1 / judge2 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 61 |
ソースコード
pub mod scanner { pub struct Scanner { buf: Vec<String>, } impl Scanner { pub fn new() -> Self { Self { buf: vec![] } } pub fn new_from(source: &str) -> Self { let source = String::from(source); let buf = Self::split(source); Self { buf } } pub fn next<T: std::str::FromStr>(&mut self) -> T { loop { if let Some(x) = self.buf.pop() { return x.parse().ok().expect(""); } let mut source = String::new(); std::io::stdin().read_line(&mut source).expect(""); self.buf = Self::split(source); } } fn split(source: String) -> Vec<String> { source .split_whitespace() .rev() .map(String::from) .collect::<Vec<_>>() } } } use crate::scanner::Scanner; use std::{collections::BTreeMap, io::Write}; fn main() { let mut scanner = Scanner::new(); let out = std::io::stdout(); let mut out = std::io::BufWriter::new(out.lock()); let t: usize = 1; for _ in 0..t { solve(&mut scanner, &mut out); } } fn solve(scanner: &mut Scanner, out: &mut std::io::BufWriter<std::io::StdoutLock>) { let h = scanner.next::<usize>(); let w = scanner.next::<usize>(); let a = (0..h) .map(|_| (0..w).map(|_| scanner.next::<usize>()).collect::<Vec<_>>()) .collect::<Vec<_>>(); let mut sum = BTreeMap::<(usize, usize, usize, usize), usize>::new(); let mut rev = BTreeMap::<(usize, usize), Vec<(usize, usize, usize, usize)>>::new(); for i in 0..h { let key = (i, 0, 0, 1); let mut now = 0; for j in 0..w { now += a[i][j]; rev.entry((i, j)).or_insert(vec![]).push(key); } sum.insert(key, now); } for j in 0..w { let key = (0, j, 1, 0); let mut now = 0; for i in 0..h { now += a[i][j]; rev.entry((i, j)).or_insert(vec![]).push(key); } sum.insert(key, now); } for i in 0..h + w - 1 { let key = (i, 0, !0, 1); let mut now = 0; for j in 0..w { if i - j < h { now += a[i - j][j]; rev.entry((i - j, j)).or_insert(vec![]).push(key); } } sum.insert(key, now); } for i in 0..h + w - 1 { let key = (i, w - 1, !0, !0); let mut now = 0; for j in 0..w { if i - j < h { now += a[i - j][w - j - 1]; rev.entry((i - j, w - j - 1)).or_insert(vec![]).push(key); } } sum.insert(key, now); } let mut ans = 0; for (k1, v1) in &sum { for (k2, v2) in &sum { if k1 == k2 { ans = ans.max(*v1); continue; } let mut res = *v1 + *v2; let mut ci = k1.0; let mut cj = k1.1; for _ in 0..(h + w) * 2 + 10 { if ci < h && cj < w { let mut count = 0; for k3 in &rev[&(ci, cj)] { if k1 == k3 || k2 == k3 { count += 1; } } if count == 2 { res -= a[ci][cj]; break; } } ci += k1.2; cj += k1.3; } ans = ans.max(res); } } writeln!(out, "{}", ans).unwrap(); }