Module b
Expand description
ยงABC 405 B - Not All
refs: https://atcoder.jp/contests/abc405/tasks/abc405_b
use std::collections::HashSet;
use proconio::input;
fn main() {
input! {
n: usize, m: usize,
a: [usize; n]
}
let mut presence = HashSet::new();
for (i, ai) in a.iter().enumerate() {
presence.insert(ai);
if presence.len() == m {
println!("{}", n - i);
return;
}
}
println!("0");
}