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  1. use std::collections::BTreeMap;
  2. use std::ops::Bound::Included;
  3.  
  4. fn main () {
  5.     test();
  6. }
  7.  
  8. fn test() {
  9.     let mut bt: BTreeMap<u128, u128> = BTreeMap::new();
  10.     let mut a: u128 = 0;
  11.     let div: u128 = 8;
  12.     for x in 0..100_u128 {
  13.         for y in 0..100_u128 {
  14.             let zey = zeeify(x*div, y*div);
  15.             a += 1;
  16.             bt.insert(zey, a);
  17.         }
  18.     }
  19.     let test = 400;
  20.     println!("{:?}", zee_neighbors(test, 8));
  21.     let n = zee_neighbors(400, 8);
  22.     // [x: 40 y: 40] -> [x: 48, y: 48]
  23.     let xs = 46;
  24.     let ys = 46;
  25.     for r in 0..div {
  26.         let yss = (ys-div/2) + r;
  27.         let xss = (xs-div/2);
  28.         let minzee = zeeify(xss, yss);
  29.         let maxzee = zeeify(xss+div, yss);
  30.         for v in bt.range( (Included(minzee), Included(maxzee)) ) {
  31.             println!("{:?}", v);
  32.         }
  33.     }
  34.  
  35. }
  36.  
  37. fn abs_u128(a: u128, b: u128) -> u128 {
  38.     if a > b {a - b} else { b-a }
  39. }
  40.  
  41. fn zee_neighbors(zee: u128, div: u128) -> [u128; 4] {
  42.     let a: u128 = 0b10101010101010101010101010101010;
  43.     let b: u128 = 0b01010101010101010101010101010101;
  44.     let t: u128 = ((zee & a) - div & a) | (zee & b);
  45.     let b: u128 = ((zee & b) + div & a) | (zee & b);
  46.     let l: u128 = ((zee & b) - div & b) | (zee & a);
  47.     let r: u128 = ((zee & a) + div & b) | (zee & a);
  48.     [t,b,l,r]
  49. }
  50.  
  51. fn zeeify(a: u128, b: u128) -> u128 {
  52.     let mut f: u128 = 0;
  53.     for i in 0..16 {
  54.         f |= ((a & 1<<i) << i) | ((b & 1<<i) << i+1);
  55.         //println!("{:b} {:b} | {:b} {:b} | {:b}", a, a&1<<i, b, b&1<<i, f);
  56.     }
  57.     f
  58. }
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