結果
問題 | No.898 tri-βutree |
ユーザー | ziita |
提出日時 | 2019-10-06 19:45:15 |
言語 | Rust (1.77.0 + proconio) |
結果 |
AC
|
実行時間 | 479 ms / 4,000 ms |
コード長 | 5,992 bytes |
コンパイル時間 | 27,093 ms |
コンパイル使用メモリ | 377,920 KB |
実行使用メモリ | 104,320 KB |
最終ジャッジ日時 | 2024-11-08 22:55:35 |
合計ジャッジ時間 | 22,672 ms |
ジャッジサーバーID (参考情報) |
judge1 / judge4 |
(要ログイン)
テストケース
テストケース表示入力 | 結果 | 実行時間 実行使用メモリ |
---|---|---|
testcase_00 | AC | 352 ms
104,320 KB |
testcase_01 | AC | 1 ms
5,248 KB |
testcase_02 | AC | 2 ms
5,248 KB |
testcase_03 | AC | 1 ms
5,248 KB |
testcase_04 | AC | 2 ms
5,248 KB |
testcase_05 | AC | 1 ms
5,248 KB |
testcase_06 | AC | 1 ms
5,248 KB |
testcase_07 | AC | 441 ms
97,024 KB |
testcase_08 | AC | 446 ms
96,896 KB |
testcase_09 | AC | 455 ms
97,024 KB |
testcase_10 | AC | 479 ms
97,024 KB |
testcase_11 | AC | 463 ms
96,896 KB |
testcase_12 | AC | 462 ms
96,896 KB |
testcase_13 | AC | 453 ms
97,024 KB |
testcase_14 | AC | 465 ms
96,896 KB |
testcase_15 | AC | 453 ms
97,024 KB |
testcase_16 | AC | 437 ms
96,896 KB |
testcase_17 | AC | 436 ms
97,024 KB |
testcase_18 | AC | 433 ms
96,896 KB |
testcase_19 | AC | 435 ms
97,024 KB |
testcase_20 | AC | 428 ms
96,896 KB |
testcase_21 | AC | 433 ms
96,896 KB |
ソースコード
#![allow(unused_imports)] #![allow(dead_code)] #![allow(non_camel_case_types)] #![allow(non_snake_case)] use std::cmp::*; use std::collections::*; use std::ops::*; use std::io::{Write, BufWriter}; const MOD: usize = 998244353; // https://qiita.com/tanakh/items/0ba42c7ca36cd29d0ac8 macro_rules! input { ($($r:tt)*) => { let stdin = std::io::stdin(); let mut bytes = std::io::Read::bytes(std::io::BufReader::new(stdin.lock())); let mut next = move || -> String{ bytes .by_ref() .map(|r|r.unwrap() as char) .skip_while(|c|c.is_whitespace()) .take_while(|c|!c.is_whitespace()) .collect() }; input_inner!{next, $($r)*} }; } macro_rules! input_inner { ($next:expr) => {}; ($next:expr, ) => {}; ($next:expr, $var:ident : $t:tt $($r:tt)*) => { let $var = read_value!($next, $t); input_inner!{$next $($r)*} }; } macro_rules! read_value { ($next:expr, ( $($t:tt),* )) => { ( $(read_value!($next, $t)),* ) }; ($next:expr, [ $t:tt ; $len:expr ]) => { (0..$len).map(|_| read_value!($next, $t)).collect::<Vec<_>>() }; ($next:expr, chars) => { read_value!($next, String).chars().collect::<Vec<char>>() }; ($next:expr, usize1) => { read_value!($next, usize) - 1 }; ($next:expr, [ $t:tt ]) => {{ let len = read_value!($next, usize); (0..len).map(|_| read_value!($next, $t)).collect::<Vec<_>>() }}; ($next:expr, $t:ty) => { $next().parse::<$t>().expect("Parse error") }; } #[derive(Copy,Clone)] struct Pair<T,U> { x: T, y: U, } impl<T,U> Pair<T,U> { fn new(x: T, y: U) -> Pair<T,U> { Pair { x: x, y: y, } } } struct euler_tour { G: Vec<Vec<Pair<usize,i64>>>, tour: Vec<usize>, L: Vec<usize>, R: Vec<usize>, depth: Vec<usize>, weight: Vec<i64>, n: usize, } impl euler_tour{ fn new(n: usize) -> euler_tour { euler_tour{ G: vec![vec![];n], tour: vec![], L: vec![0;n], R: vec![0;n], depth: vec![0;n], weight: vec![0;n], n: n, } } fn add_edge(&mut self, s: usize, t: usize, w: i64){ self.G[s].push(Pair::new(t,w)); self.G[t].push(Pair::new(s,w)); } fn init(&mut self, root: usize) { self.dfs(root, self.n, 0, 0); } fn dfs(&mut self, v: usize, p: usize, d: usize, w: i64){ self.tour.push(v); self.L[v] = self.tour.len()-1; self.depth[v] = d; self.weight[v] = w; for z in self.G[v].clone() { if z.x == p {continue;} self.dfs(z.x, v, d+1, w+z.y); self.tour.push(v); } self.R[v] = self.tour.len()-1; } } struct sparse_table { log_t: Vec<usize>, table: Vec<Vec<Pair<usize,usize>>>, n: usize, } impl sparse_table { fn new() -> sparse_table{ sparse_table{ log_t: vec![], table: vec![vec![]], n: 0, } } fn init(&mut self, arr: Vec<Pair<usize,usize>>) { let n = arr.len(); let mut lt: Vec<usize> = vec![0;n+1]; for i in 2..n+1 { lt[i] = lt[i >> 1] + 1; } let sz = lt[n]; self.log_t = lt; self.table = vec![vec![Pair::new(usize::max_value(),0);sz+1];n]; self.n = n; for i in 0..n { self.table[i][0] = arr[i]; } for k in 1..n { if (1 << k) > n {break;} for i in 0..n { if i + (1 << k) > n {break;} self.table[i][k] = { let a = self.table[i][k - 1]; let b = self.table[i + (1 << (k - 1))][k - 1]; if a.x <= b.x {a} else {b} }; } } } fn query(&mut self, s: usize, t: usize) -> Pair<usize,usize> { let k = self.log_t[t-s+1]; let a = self.table[s][k]; let b = self.table[t + 1 - (1 << k)][k]; if a.x <= b.x {a} else {b} } } struct LCA{ euler: euler_tour, st: sparse_table, n: usize, } impl LCA{ fn new(n: usize) -> LCA { LCA{ euler: euler_tour::new(n), st: sparse_table::new(), n: n, } } fn add_edge(&mut self, s: usize, t: usize, w: i64){ self.euler.G[s].push(Pair::new(t,w)); self.euler.G[t].push(Pair::new(s,w)); } fn init(&mut self) { self.euler.dfs(0, self.n, 0, 0); let sz = self.euler.tour.len(); let mut arr: Vec<Pair<usize,usize>> = vec![Pair::new(0,0);sz]; for i in 0..sz { arr[i] = Pair::new(self.euler.depth[self.euler.tour[i]], self.euler.tour[i]); } self.st.init(arr); } fn lca(&mut self, s: usize, t: usize) -> usize { self.st.query(min(self.euler.L[s],self.euler.L[t]), max(self.euler.R[s], self.euler.R[t])).y } } fn dist(x: usize, y: usize, lca: &mut LCA) -> i64 { let c = lca.lca(x,y); lca.euler.weight[x] + lca.euler.weight[y] - 2*lca.euler.weight[c] } fn solve() { input! { n: usize, a: [[usize;3];n-1], q: usize, b: [[usize;3];q], } let mut lca = LCA::new(n); for i in 0..n-1{ lca.add_edge(a[i][0], a[i][1], a[i][2] as i64); } lca.init(); for i in 0..q { let x = b[i][0]; let y = b[i][1]; let z = b[i][2]; let ans = dist(x,y,&mut lca) + dist(y,z,&mut lca) + dist(x,z,&mut lca); println!("{}", ans/2); } } fn main() { // In order to avoid potential stack overflow, spawn a new thread. let stack_size = 104_857_600; // 100 MB let thd = std::thread::Builder::new().stack_size(stack_size); thd.spawn(|| solve()).unwrap().join().unwrap(); }