Coin de Gamma
11 months ago
1 changed files with 95 additions and 0 deletions
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use std::collections::HashSet; |
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type Str = Vec<u8>; |
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type Res = HashSet<u32>; |
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fn pr(s: &Str) { |
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for c in s.iter() { print!("{}", c); } |
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println!(""); |
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} |
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fn get_eq(s: &Str, p: usize, q: usize) -> (u32, u32, u32) { |
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let mut a: u32 = 0; |
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for i in 0..p { |
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a *= 10; |
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a += s[i] as u32; |
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} |
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let mut b: u32 = 0;
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for i in p..q { |
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b *= 10; |
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b += s[i] as u32; |
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} |
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let mut c: u32 = 0; |
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for i in q..s.len() { |
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c *= 10; |
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c += s[i] as u32; |
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} |
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return (a, b, c); |
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} |
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fn test(s: &Str, hs: &mut Res) { |
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for p in 1..s.len() { |
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for q in p..s.len() { |
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let (a, b, c) = get_eq(&s, p, q); |
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//println!("{} * {} = {}", a, b, c);
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if a * b == c { |
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hs.insert(c); |
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println!("{} * {} = {}", a, b, c); |
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} |
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} |
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} |
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} |
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fn sp(s: &Str, fx: usize, k: usize) -> Str { |
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let mut res = Vec::new(); |
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for i in 0..fx { |
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res.push(s[i]); |
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} |
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res.push(s[k]); |
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for i in fx..s.len() { |
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if i != k { res.push(s[i]); } |
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} |
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res |
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} |
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fn lp(s: &Str, fx: usize, keep_first: bool, mut count: usize, hs: &mut Res) -> usize { |
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let kf = 0; //if keep_first { 0usize } else { 1usize };
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for k in (fx + kf)..s.len() { |
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let ss = sp(&s, fx, k); |
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//count += 1;
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if ss != *s || keep_first { |
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count += 1; |
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test(&ss, hs); |
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} |
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count = lp(&ss, fx + 1, false, count, hs); |
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} |
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count |
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} |
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fn main() { |
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let mut s = Vec::new(); |
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s.push(1); |
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s.push(2); |
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s.push(3); |
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s.push(4); |
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s.push(5); |
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s.push(6); |
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s.push(7); |
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s.push(8); |
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s.push(9); |
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//test(&s);
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let mut hs = HashSet::new(); |
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lp(&s, 0, true, 0, &mut hs); |
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println!("count: {}", hs.len()); |
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let mut sum = 0u32; |
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for p in hs { |
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sum += p; |
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} |
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println!("sum = {}", sum); |
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} |
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