1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
pub mod table;
use table::Table;
trait Die {
fn roll(&self) -> u32;
fn distribution(&self) -> Distribution;
}
#[derive(Debug)]
pub struct Distribution {
values: Vec<u32>,
at_least: Vec<u32>,
at_most: Vec<u32>,
total_permutations: u32,
min: u32,
}
impl Distribution {
pub fn new(outcomes: &[u32]) -> Distribution {
let min = outcomes.iter().min().unwrap();
let max = outcomes.iter().max().unwrap();
let len = (max - min) as usize + 1;
let mut values = Vec::with_capacity(len);
let mut at_least = Vec::with_capacity(len);
let mut at_most = Vec::with_capacity(len);
for _ in 0..len {
values.push(0u32);
}
for &o in outcomes {
let o = (o - min) as usize;
values[o] += 1;
}
let mut at_least_c = outcomes.len() as u32;
let mut at_most_c = 0;
for v in &values {
at_least.push(at_least_c);
at_least_c -= *v;
at_most_c += *v;
at_most.push(at_most_c);
}
Distribution {
values: values,
at_least: at_least,
at_most: at_most,
total_permutations: outcomes.len() as u32,
min: *min }
}
pub fn min(&self) -> u32 {
self.min
}
pub fn max(&self) -> u32 {
self.min() + (self.values.len() as u32) - 1
}
pub fn exactly(&self) -> Table {
Table::new(self.min() as usize, self.total_permutations(), self.values.clone())
}
pub fn at_least(&self) -> Table {
Table::new(self.min() as usize, self.total_permutations(), self.at_least.clone())
}
pub fn at_most(&self) -> Table {
Table::new(self.min() as usize, self.total_permutations(), self.at_most.clone())
}
pub fn possible_permutations(&self) -> u32 {
self.total_permutations
}
pub fn total_permutations(&self) -> u32 {
self.total_permutations
}
pub fn total_combinations(&self) -> u32 {
self.max() - self.min()
}
pub fn mean(&self) -> f32 {
0.0
}
pub fn std_dev(&self) -> f32 {
0.0
}
}
#[cfg(test)]
mod tests {
#[test]
fn it_works() {
let dist = super::Distribution::new(&[1, 2, 3, 4, 5, 6]);
assert!(dist.min() == 1);
assert!(dist.max() == 6);
println!("Exact: {:?}", dist.exactly());
println!("At least: {:?}", dist.at_least());
println!("At most: {:?}", dist.at_most());
assert!(true);
}
#[test]
fn com() {
let a = [1u32, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20];
let mut v = Vec::with_capacity(a.len() * a.len() * a.len());
for i in &a {
for j in &a {
for k in &a {
v.push(i + j + k);
}
}
}
let dist = super::Distribution::new(&v);
println!("Exact: {:?}", dist.exactly());
println!("At least: {:?}", dist.at_least());
println!("At most: {:?}", dist.at_most().chance_of(2));
assert!(false);
}
}