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pub fn lis(a: &[i64]) -> Vec<i64> {
let n = a.len();
const INF: i64 = std::i64::MAX;
let mut f = vec![INF; n];
for &x in a.iter() {
for v in f.iter_mut() {
if *v < x {
continue;
}
*v = x;
break;
}
}
for (i, v) in f.iter().enumerate() {
if *v != INF {
continue;
}
return f[..i].to_vec();
}
f
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test() {
let arr = [4, 2, 8, 5, 6, 6];
assert_eq!(lis(&arr), vec![2, 5, 6]);
}
}