use std::collections::HashSet; use std::collections::VecDeque; type Str = VecDeque; type Res = HashSet; fn nstr(n: u64) -> Str { let mut res = Str::new(); let mut nn = n; while nn > 0 { res.push_front((nn % 10) as u8); nn /= 10; } res } fn strn(s: &Str) -> u64 { let mut res = 0; for d in s.iter() { res *= 10; res += *d as u64; } res } fn strnn(s: &Str, p: usize) -> u64 { let mut ss = Str::new(); for q in p..p + 3 { ss.push_back(*s.get(q).unwrap()); } return strn(&ss); } fn test(s: &Str) -> bool { // { // let nnn = strn(s); // if nnn == 1406357289 { // println!("!!{}", nnn); // } //} let ps = [2,3,5,7,11,13,17]; for k in 1..8 { let n = strnn(s, k); //println!("{}", n); if n % ps[(k - 1)] != 0 { //println!("{} {}", n, ps[k-1]); return false; } } return true; } fn sp(s: &Str, fx: usize, k: usize) -> Str { let mut res = Str::new(); for i in 0..fx { res.push_back(s[i]); } res.push_back(s[k]); for i in fx..s.len() { if i != k { res.push_back(s[i]); } } res } fn lp(s: &Str, fx: usize, keep_first: bool, hs: &mut Res) { let kf = 0; //if keep_first { 0usize } else { 1usize }; for k in (fx + kf)..s.len() { let ss = sp(&s, fx, k); if ss != *s || keep_first { if test(&ss) { let n = strn(&ss); hs.insert(n); } } lp(&ss, fx + 1, false, hs); } } fn main() { let mut hs = HashSet::new(); let s = nstr(1234567890); let mut sum = 0u64; //let mut ttt = 9876543210u64; //{ // let rrrr = nstr(1406357289); // let tt = test(&rrrr); // println!("{}", tt); //} //return; lp(&s, 0, true, &mut hs); for h in hs.iter() { println!("{}", h); sum += *h; } println!("{}", sum); }