結果
| 問題 |
No.1283 Extra Fee
|
| コンテスト | |
| ユーザー |
Strorkis
|
| 提出日時 | 2020-11-06 22:53:13 |
| 言語 | Rust (1.83.0 + proconio) |
| 結果 |
MLE
|
| 実行時間 | - |
| コード長 | 3,049 bytes |
| コンパイル時間 | 14,106 ms |
| コンパイル使用メモリ | 384,072 KB |
| 実行使用メモリ | 813,184 KB |
| 最終ジャッジ日時 | 2024-07-22 13:27:47 |
| 合計ジャッジ時間 | 15,342 ms |
|
ジャッジサーバーID (参考情報) |
judge5 / judge4 |
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| ファイルパターン | 結果 |
|---|---|
| other | AC * 11 MLE * 1 -- * 18 |
ソースコード
pub mod procon_input {
use std::{str::FromStr, iter::FromIterator};
pub fn read_line() -> String {
let mut input = String::new();
std::io::stdin().read_line(&mut input).ok();
input
}
pub fn parse<T: FromStr>(s: &str) -> T {
s.parse().ok().unwrap()
}
pub fn read<T: FromStr>() -> T {
parse(read_line().trim_end())
}
pub fn read_collection<T: FromStr, C: FromIterator<T>>() -> C {
read_line().split_whitespace().map(parse).collect()
}
#[macro_export]
macro_rules! read_tuple {
( $( $t:ty ),* ) => {{
let input = read_line();
let mut iter = input.split_whitespace();
( $( parse::<$t>(iter.next().unwrap()) ),* )
}};
}
}
use procon_input::*;
fn dijkstra(
graph: &Vec<Vec<usize>>, tolls: &Vec<i64>
) -> Vec<Vec<i64>> {
use std::collections::BinaryHeap;
use std::cmp::Reverse;
let n = graph.len();
let mut heap = BinaryHeap::new();
let mut dist = vec![vec![1 << 60; n]; n];
for s in 0..n {
heap.push((Reverse(tolls[s]), s));
dist[s][s] = tolls[s];
while let Some((Reverse(cost), from)) = heap.pop() {
for &to in &graph[from] {
let next_cost = cost + 1 + tolls[to];
if next_cost < dist[s][to] {
heap.push((Reverse(next_cost), to));
dist[s][to] = next_cost;
}
}
}
}
dist
}
fn solve(writer: &mut std::io::BufWriter<std::io::StdoutLock>) {
use std::io::Write;
let (n, m) = read_tuple!(usize, usize);
let mut graph = vec![vec![]; n * n];
for h in 0..n {
for w in 0..n {
let u = h * n + w;
if w + 1 < n {
let v = h * n + (w + 1);
graph[u].push(v);
graph[v].push(u);
}
if h + 1 < n {
let v = (h + 1) * n + w;
graph[u].push(v);
graph[v].push(u);
}
}
}
let mut tolls = vec![0; n * n];
for _ in 0..m {
let (h, w, c) = read_tuple!(usize, usize, i64);
tolls[(h - 1) * n + (w - 1)] = c;
}
let dist = dijkstra(&graph, &tolls);
let mut ans = dist[0][n * n - 1];
for x in 0..(n * n) {
if tolls[x] == 0 { continue; }
use std::cmp::min;
let mut prev = std::i64::MAX;
if x % n > 0 {
prev = min(prev, dist[0][x - 1]);
}
if x / n > 0 {
prev = min(prev, dist[0][x - n])
}
let mut next = std::i64::MAX;
if x % n + 1 < n {
next = min(next, dist[x + 1][n * n - 1]);
}
if x / n + 1 < n {
next = min(next, dist[x + n][n * n - 1]);
}
ans = min(ans, prev + next + 2);
}
writeln!(writer, "{}", ans).ok();
}
fn main() {
let stdout = std::io::stdout();
let mut writer = std::io::BufWriter::new(stdout.lock());
solve(&mut writer);
}
Strorkis