#[allow(unused_imports)] use std::cmp::*; #[allow(unused_imports)] use std::collections::*; use std::io::Read; #[allow(dead_code)] fn getline() -> String { let mut ret = String::new(); std::io::stdin().read_line(&mut ret).ok().unwrap(); ret } fn get_word() -> String { let stdin = std::io::stdin(); let mut stdin=stdin.lock(); let mut u8b: [u8; 1] = [0]; loop { let mut buf: Vec = Vec::with_capacity(16); loop { let res = stdin.read(&mut u8b); if res.unwrap_or(0) == 0 || u8b[0] <= b' ' { break; } else { buf.push(u8b[0]); } } if buf.len() >= 1 { let ret = String::from_utf8(buf).unwrap(); return ret; } } } #[allow(dead_code)] fn get() -> T { get_word().parse().ok().unwrap() } fn main() { let n: usize = get(); const INF: usize = 1 << 20; let mut dp = vec![(INF, 0); n + 1]; dp[0] = (0, 0); for i in 1..275 { let v = 2 * i; for j in v * v..n + 1 { let (p, _) = dp[j - v * v]; dp[j] = min(dp[j], (p + v, v)); } } for i in (0..275).rev() { let v = 2 * i + 1; for j in v * v..n + 1 { let (p, _) = dp[j - v * v]; dp[j] = min(dp[j], (p + v, v)); } } let mut path = vec![]; let mut cur = n; while cur > 0 { let t = dp[cur].1; path.push(t); cur -= t * t; } let mut bias = 0; for v in path { for i in 0..v { print!("{}", (i + bias) % 2); } bias += v + 1; } println!(); }