fn is_kado(a: &[u64]) -> bool { assert_eq!(a.len(), 3); if a[0] == a[1] || a[1] == a[2] || a[2] == a[0] { return false; } return (a[0] < a[1] && a[1] > a[2]) || (a[0] > a[1] && a[1] < a[2]); } fn f(n: usize, a: Vec) -> u64 { let mut dp = vec![0; n]; dp[0] = 0; dp[1] = 0; if is_kado(&a[0..=2]) { dp[2] = a[0]; } for i in 3..n { dp[i] = dp[i - 1]; if is_kado(&a[(i - 2)..=i]) { dp[i] = dp[i].max(dp[i - 3] + a[i - 2]); } } dp[n - 1] } fn solve(n: usize, a: Vec) { let mut ans = 0; for &i in &[1, 2] { let mut b = a.clone(); b.rotate_left(i); ans = ans.max(f(n, b)); let mut c = a.clone(); c.rotate_right(i); ans = ans.max(f(n, c)); } ans = ans.max(f(n, a)); println!("{}", ans); } fn main() { let stdin = std::io::stdin(); let mut rd = ProconReader::new(stdin.lock()); let t: usize = rd.get(); for _ in 0..t { let n: usize = rd.get(); let a: Vec = rd.get_vec(n); solve(n, a); } } pub struct ProconReader { r: R, l: String, i: usize, } impl ProconReader { pub fn new(reader: R) -> Self { Self { r: reader, l: String::new(), i: 0, } } pub fn get(&mut self) -> T where T: std::str::FromStr, ::Err: std::fmt::Debug, { self.skip_blanks(); assert!(self.i < self.l.len()); // remain some character assert_ne!(&self.l[self.i..=self.i], " "); let rest = &self.l[self.i..]; let len = rest.find(' ').unwrap_or_else(|| rest.len()); let val = rest[..len] .parse() .unwrap_or_else(|_| panic!("parse error `{}`", rest)); self.i += len; val } fn skip_blanks(&mut self) { loop { match self.l[self.i..].find(|ch| ch != ' ') { Some(j) => { self.i += j; break; } None => { self.l.clear(); self.i = 0; let num_bytes = self .r .read_line(&mut self.l) .unwrap_or_else(|_| panic!("invalid UTF-8")); assert!(num_bytes > 0, "reached EOF :("); self.l = self .l .trim_end_matches('\n') .trim_end_matches('\r') .to_string(); } } } } pub fn get_vec(&mut self, n: usize) -> Vec where T: std::str::FromStr, ::Err: std::fmt::Debug, { (0..n).map(|_| self.get()).collect() } pub fn get_chars(&mut self) -> Vec { self.get::().chars().collect() } }