// ---------- begin Run Length Encoding ---------- fn run_length_encoding(a: Vec) -> Vec<(T, usize)> { let mut a = a.into_iter().map(|a| (a, 1)).collect::>(); a.dedup_by(|a, b| { a.0 == b.0 && { b.1 += a.1; true } }); a } // ---------- end Run Length Encoding ---------- // ---------- begin scannner ---------- #[allow(dead_code)] mod scanner { use std::str::FromStr; pub struct Scanner<'a> { it: std::str::SplitWhitespace<'a>, } impl<'a> Scanner<'a> { pub fn new(s: &'a String) -> Scanner<'a> { Scanner { it: s.split_whitespace(), } } pub fn next(&mut self) -> T { self.it.next().unwrap().parse::().ok().unwrap() } pub fn next_bytes(&mut self) -> Vec { self.it.next().unwrap().bytes().collect() } pub fn next_chars(&mut self) -> Vec { self.it.next().unwrap().chars().collect() } pub fn next_vec(&mut self, len: usize) -> Vec { (0..len).map(|_| self.next()).collect() } } } // ---------- end scannner ---------- use std::io::Write; use std::collections::*; type Map = BTreeMap; type Set = BTreeSet; type Deque = VecDeque; fn main() { use std::io::Read; let mut s = String::new(); std::io::stdin().read_to_string(&mut s).unwrap(); let mut sc = scanner::Scanner::new(&s); let out = std::io::stdout(); let mut out = std::io::BufWriter::new(out.lock()); run(&mut sc, &mut out); } fn run(sc: &mut scanner::Scanner, out: &mut std::io::BufWriter) { let t: u32 = sc.next(); for _ in 0..t { let n: usize = sc.next(); let a: Vec = sc.next_vec(n); let z = run_length_encoding(a); let ans = if z.len() % 2 == 0 || (z.len() > 1 && z.iter().any(|p| p.1 > 1)) { "Yes" } else { "No" }; writeln!(out, "{}", ans).ok(); } }