#![allow(unused_imports)] #![allow(non_snake_case, unused)] use std::cmp::*; use std::collections::*; use std::ops::*; // https://atcoder.jp/contests/hokudai-hitachi2019-1/submissions/10518254 より macro_rules! eprint { ($($t:tt)*) => {{ use ::std::io::Write; let _ = write!(::std::io::stderr(), $($t)*); }}; } macro_rules! eprintln { () => { eprintln!(""); }; ($($t:tt)*) => {{ use ::std::io::Write; let _ = writeln!(::std::io::stderr(), $($t)*); }}; } macro_rules! dbg { ($v:expr) => {{ let val = $v; eprintln!("[{}:{}] {} = {:?}", file!(), line!(), stringify!($v), val); val }} } macro_rules! mat { ($($e:expr),*) => { Vec::from(vec![$($e),*]) }; ($($e:expr,)*) => { Vec::from(vec![$($e),*]) }; ($e:expr; $d:expr) => { Vec::from(vec![$e; $d]) }; ($e:expr; $d:expr $(; $ds:expr)+) => { Vec::from(vec![mat![$e $(; $ds)*]; $d]) }; } macro_rules! ok { ($a:ident$([$i:expr])*.$f:ident()$(@$t:ident)*) => { $a$([$i])*.$f($($t),*) }; ($a:ident$([$i:expr])*.$f:ident($e:expr$(,$es:expr)*)$(@$t:ident)*) => { { let t = $e; ok!($a$([$i])*.$f($($es),*)$(@$t)*@t) } }; } pub fn readln() -> String { let mut line = String::new(); ::std::io::stdin().read_line(&mut line).unwrap_or_else(|e| panic!("{}", e)); line } macro_rules! read { ($($t:tt),*; $n:expr) => {{ let stdin = ::std::io::stdin(); let ret = ::std::io::BufRead::lines(stdin.lock()).take($n).map(|line| { let line = line.unwrap(); let mut it = line.split_whitespace(); _read!(it; $($t),*) }).collect::>(); ret }}; ($($t:tt),*) => {{ let line = readln(); let mut it = line.split_whitespace(); _read!(it; $($t),*) }}; } macro_rules! _read { ($it:ident; [char]) => { _read!($it; String).chars().collect::>() }; ($it:ident; [u8]) => { Vec::from(_read!($it; String).into_bytes()) }; ($it:ident; usize1) => { $it.next().unwrap_or_else(|| panic!("input mismatch")).parse::().unwrap_or_else(|e| panic!("{}", e)) - 1 }; ($it:ident; [usize1]) => { $it.map(|s| s.parse::().unwrap_or_else(|e| panic!("{}", e)) - 1).collect::>() }; ($it:ident; [$t:ty]) => { $it.map(|s| s.parse::<$t>().unwrap_or_else(|e| panic!("{}", e))).collect::>() }; ($it:ident; $t:ty) => { $it.next().unwrap_or_else(|| panic!("input mismatch")).parse::<$t>().unwrap_or_else(|e| panic!("{}", e)) }; ($it:ident; $($t:tt),+) => { ($(_read!($it; $t)),*) }; } pub fn main() { let _ = ::std::thread::Builder::new().name("run".to_string()).stack_size(32 * 1024 * 1024).spawn(run).unwrap().join(); } const MOD: usize = 998244353; // const MOD: usize = 1_000_000_007; const INF: i64 = std::i64::MAX; // const INF: i128 = std::i128::MAX/100; fn solve() { let t = read!(usize); for i in 0..t { let n = read!(usize); let a = read!([usize]); let mut v = vec![]; for j in 1..n-1 { if a[j]==a[j-1] { v.push(j-1); v.push(j); } if a[j]==a[j+1] { v.push(j); v.push(j+1); } if a[j-1]==a[j+1] { v.push(j-1); v.push(j+1); } if a[j-1]a[j] && a[j]>a[j+1] { v.push(j-1); v.push(j); v.push(j+1); } } v.sort(); v.dedup(); if v.len()>=10 { println!("No"); continue; } let s = v.len(); let mut total = 1<>m)%2==1 { x.push(v[m]); } } if x.len()!=2 { continue; } z.swap(x[0],x[1]); let mut flag = true; for y in 1..n-1 { if z[y]==z[y-1] || z[y]==z[y+1] || z[y-1]==z[y+1]{ flag = false; } if z[y-1]z[y] && z[y]>z[y+1] { flag = false; } } z.swap(x[0],x[1]); if flag { ans = true; break; } } if ans { println!("Yes"); continue; } ans = false; if v.len()<=7 { for &t in &v { for k in 0..n { if k==t { continue; } z.swap(k,t); let mut flag = true; for y in 1..n-1 { if z[y]==z[y-1] || z[y]==z[y+1] || z[y-1]==z[y+1]{ flag = false; } if z[y-1]z[y] && z[y]>z[y+1] { flag = false; } } z.swap(k,t); if flag { ans = true; break; } } } } if ans { println!("Yes"); continue; } println!("No"); } } fn run() { let stack_size = 104_857_600; // 100 MB let thd = std::thread::Builder::new().stack_size(stack_size); solve(); }