結果
| 問題 |
No.1916 Making Palindrome on Gird
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2022-09-19 20:14:22 |
| 言語 | Rust (1.83.0 + proconio) |
| 結果 |
AC
|
| 実行時間 | 664 ms / 3,000 ms |
| コード長 | 2,711 bytes |
| コンパイル時間 | 17,934 ms |
| コンパイル使用メモリ | 379,148 KB |
| 実行使用メモリ | 5,248 KB |
| 最終ジャッジ日時 | 2024-12-22 02:38:44 |
| 合計ジャッジ時間 | 19,994 ms |
|
ジャッジサーバーID (参考情報) |
judge5 / judge3 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 30 |
コンパイルメッセージ
warning: unused imports: `HashSet`, `VecDeque`
--> src/main.rs:1:24
|
1 | use std::collections::{VecDeque, HashSet, HashMap};
| ^^^^^^^^ ^^^^^^^
|
= note: `#[warn(unused_imports)]` on by default
ソースコード
use std::collections::{VecDeque, HashSet, HashMap};
const SDX: [isize; 2] = [1, 0];
const SDY: [isize; 2] = [0, 1];
const EDX: [isize; 2] = [-1, 0];
const EDY: [isize; 2] = [0, -1];
const MOD: usize = 1e9 as usize + 7;
fn main() {
let mut hw = String::new();
std::io::stdin().read_line(&mut hw).ok();
let hw: Vec<usize> = hw.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
let h = hw[0];
let w = hw[1];
let grid = (0..h).map(|_| {
let mut s = String::new();
std::io::stdin().read_line(&mut s).ok();
let s = s.trim();
s.chars().collect::<Vec<char>>()
})
.collect::<Vec<_>>();
let mut dp = HashMap::new();
let middle = (h+w)/2-1;
if (h+w) % 2 == 0 {
for i in 0..h.min(w) {
let (x, y) = if h > w { (middle-i, i) } else { (i, middle-i) };
dp.insert((x, y, x, y), 1);
}
} else {
for i in 0..h.min(w) {
let (x, y) = if h > w { (middle - i, i) } else { (i, middle - i) };
for dir in 0..2 {
let nx = x as isize + SDX[dir];
let ny = y as isize + SDY[dir];
if nx >= 0 && ny >= 0 && nx < h as isize && ny < w as isize {
let nx = nx as usize;
let ny = ny as usize;
if grid[x][y] == grid[nx][ny] {
*dp.entry((x, y, nx, ny)).or_insert(0usize) += 1;
}
}
}
}
}
for _ in 0..middle {
let mut next_dp = HashMap::new();
for (&(sx, sy, gx, gy), &cnt) in dp.iter() {
for sdir in 0..2 {
let nsx = sx as isize + EDX[sdir];
let nsy = sy as isize + EDY[sdir];
if !(nsx >= 0 && nsy >= 0 && nsx < h as isize && nsy < w as isize) { continue; }
let nsx = nsx as usize;
let nsy = nsy as usize;
for edir in 0..2 {
let ngx = gx as isize + SDX[edir];
let ngy = gy as isize + SDY[edir];
if ngx >= 0 && ngy >= 0 && ngx < h as isize && ngy < w as isize {
let ngx = ngx as usize;
let ngy = ngy as usize;
if grid[nsx][nsy] == grid[ngx][ngy] {
*next_dp.entry((nsx, nsy, ngx, ngy)).or_insert(0usize) += cnt;
*next_dp.entry((nsx, nsy, ngx, ngy)).or_insert(0usize) %= MOD;
}
}
}
}
}
dp = next_dp;
}
println!("{}", dp.get(&(0,0,h-1,w-1)).unwrap_or(&0));
}