59 lines
1.6 KiB
Rust
59 lines
1.6 KiB
Rust
use std::io::{BufWriter, stdin, Write};
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enum Operation {
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VisIn,
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VisOut
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}
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fn main() {
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let mut line = String::new();
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stdin().read_line(&mut line).unwrap();
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let mut out = BufWriter::new(std::io::stdout());
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let mut iter = line
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.trim()
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.split(' ')
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.map(|x| x.trim().parse::<u64>().unwrap());
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let n = iter.next().unwrap();
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let m = iter.next().unwrap();
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let mut vis = vec![false; n as usize];
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let mut arr: Vec<u64> = vec![];
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let mut stack: Vec<(Operation, u64)> = vec![];
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for i in (0..n).rev() {
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stack.push((Operation::VisOut, i));
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stack.push((Operation::VisIn, i));
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}
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while !stack.is_empty() {
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let item = stack.pop().unwrap();
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match item.0 {
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Operation::VisIn => {
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arr.push(item.1);
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if arr.len() == m as usize {
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for &val in &arr {
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write!(out, "{} ", val + 1).unwrap();
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}
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writeln!(out, "").unwrap();
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continue;
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}
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let idx = item.1 as usize;
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vis[idx] = true;
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for j in (0..n).rev() {
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if !vis[j as usize] {
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stack.push((Operation::VisOut, j));
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stack.push((Operation::VisIn, j));
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}
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}
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}
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Operation::VisOut => {
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let idx = item.1 as usize;
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vis[idx] = false;
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arr.pop();
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}
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}
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}
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}
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