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#[allow(dead_code)]
fn read<T: std::str::FromStr>() -> T {
let mut s = String::new();
std::io::stdin().read_line(&mut s).ok();
s.trim().parse().ok().unwrap()
}
#[allow(dead_code)]
fn read_vec<T: std::str::FromStr>() -> Vec<T> {
read::<String>()
.split_whitespace()
.map(|e| e.parse().ok().unwrap())
.collect()
}
#[allow(dead_code)]
fn read_mat<T: std::str::FromStr>(n: u32) -> Vec<Vec<T>> {
(0..n).map(|_| read_vec()).collect()
}
fn main() {
let mut tt = read::<u64>();
while tt > 0 {
let _ = read::<u64>();
let s = read::<String>();
let ones = s.chars().filter(|&ch| ch == '1').count();
let zrs = s.chars().filter(|&ch| ch == '0').count();
if zrs > ones {
println!("YES");
} else {
if s.contains("01") || s.contains("10") {
println!("YES");
} else {
println!("NO")
}
}
tt -= 1;
}
}
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