31 lines
893 B
Rust
31 lines
893 B
Rust
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fn main() {
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use std::io::stdin;
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use std::collections::HashSet;
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let mut buf:String = String::new();
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stdin().read_line(&mut buf).ok();
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let n:usize = buf.trim().parse().unwrap();
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buf.clear();
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let mut a:Vec<i32> = Vec::with_capacity(n);
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stdin().read_line(&mut buf).ok();
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buf.trim().split(' ').for_each(|val| a.push(val.parse().unwrap()));
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let mut mp:HashSet<i32> = HashSet::new();
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let mut res = vec![];
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let mut l = 0usize;
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for i in 0..n {
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if mp.contains(&a[i]) {
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res.push([l,i]);
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l = i + 1;
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mp.clear();
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} else {
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mp.insert(a[i]);
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}
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}
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if res.is_empty() {
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println!("-1");
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} else {
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let m = res.len();
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println!("{}",res.len());
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res[m-1] = [res[m-1][0],n-1];
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res.into_iter().for_each(|[l,r]| println!("{} {}",l+1,r+1));
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}
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}
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