use std::io::Write; use std::collections::*; fn run() { input! { n: usize, e: [(usize1, usize1); n - 1], } let mut g = vec![vec![]; n]; for (a, b) in e { g[a].push(b); g[b].push(a); } let mut topo = vec![0]; for i in 0..n { let v = topo[i]; for u in g[v].clone() { g[u].retain(|p| *p != v); topo.push(u); } } let mut size = vec![1; n]; let mut h = vec![BinaryHeap::new(); n]; for &v in topo.iter().rev() { if g[v].is_empty() { continue; } g[v].sort_by_key(|u| size[*u]); let mut pq = BinaryHeap::new(); for (i, &u) in g[v].iter().enumerate() { if i < 2 { size[v] += size[u]; } else { pq.push(size[u]); } pq.append(&mut h[u]); } if g[v].len() == 1 { size[v] += pq.pop().unwrap_or(0); } h[v] = pq; } println!("{}", size[0]); } fn main() { run(); } // ---------- begin input macro ---------- // reference: https://qiita.com/tanakh/items/0ba42c7ca36cd29d0ac8 #[macro_export] macro_rules! input { (source = $s:expr, $($r:tt)*) => { let mut iter = $s.split_whitespace(); input_inner!{iter, $($r)*} }; ($($r:tt)*) => { let s = { use std::io::Read; let mut s = String::new(); std::io::stdin().read_to_string(&mut s).unwrap(); s }; let mut iter = s.split_whitespace(); input_inner!{iter, $($r)*} }; } #[macro_export] macro_rules! input_inner { ($iter:expr) => {}; ($iter:expr, ) => {}; ($iter:expr, $var:ident : $t:tt $($r:tt)*) => { let $var = read_value!($iter, $t); input_inner!{$iter $($r)*} }; } #[macro_export] macro_rules! read_value { ($iter:expr, ( $($t:tt),* )) => { ( $(read_value!($iter, $t)),* ) }; ($iter:expr, [ $t:tt ; $len:expr ]) => { (0..$len).map(|_| read_value!($iter, $t)).collect::>() }; ($iter:expr, chars) => { read_value!($iter, String).chars().collect::>() }; ($iter:expr, bytes) => { read_value!($iter, String).bytes().collect::>() }; ($iter:expr, usize1) => { read_value!($iter, usize) - 1 }; ($iter:expr, $t:ty) => { $iter.next().unwrap().parse::<$t>().expect("Parse error") }; } // ---------- end input macro ----------