72 lines
1.6 KiB
Rust
72 lines
1.6 KiB
Rust
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use rand::Rng;
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use std::time::Instant;
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type Ticket = [u8; 5];
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const NUM_ENTRIES: usize = 10_000_000;
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// println!("char: {}", rand::random::<char>());
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fn gen_num() -> u8 {
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rand::thread_rng().gen_range(0..90)
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}
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fn gen_ticket() -> Ticket {
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let num1 = gen_num();
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let mut num2: u8 = gen_num();
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while num2 == num1 {
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num2 = gen_num()
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}
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let mut num3: u8 = gen_num();
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while num3 == num1 || num3 == num2 {
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num3 = gen_num()
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}
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let mut num4: u8 = gen_num();
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while num4 == num1 || num4 == num2 || num4 == num3 {
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num4 = gen_num()
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}
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let mut num5: u8 = gen_num();
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while num5 == num1 || num5 == num2 || num5 == num3 || num5 == num4 {
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num5 = gen_num()
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}
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[num1, num2, num3, num4, num5]
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}
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fn num_matches(t1: Ticket, t2: Ticket) -> usize {
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let mut result = 0;
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for n1 in t1 {
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for n2 in t2 {
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if n1 == n2 {
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result += 1;
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}
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}
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}
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result
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}
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fn main() {
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println!("Generating entries");
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let mut entries: Vec<Ticket> = Vec::with_capacity(NUM_ENTRIES);
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for _ in 0..NUM_ENTRIES {
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entries.push(gen_ticket());
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}
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let winning = gen_ticket();
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let start = Instant::now();
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println!("Counting winners...");
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let mut winners: [usize; 6] = [0, 0, 0, 0, 0, 0];
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for n in entries {
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let num_winning = num_matches(n, winning);
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winners[num_winning] += 1
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}
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let duration = start.elapsed();
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println!(
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"Winners: {:?}\nTime Elapsed: {}ms",
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winners,
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duration.subsec_millis()
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);
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}
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