Klarner-Rado sequence: Difference between revisions
Add Rust implementation
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(Add Rust implementation) |
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One hundred thousandth element: 2,911,581
One millionth element: 54,381,285</pre>
=={{header|Rust}}==
{{trans|Java}}
<syntaxhighlight lang="Rust">
fn main() {
let limit = 1_000_000;
let klarner_rado = initialise_klarner_rado_sequence(limit);
println!("The first 100 elements of the Klarner-Rado sequence:");
for i in 1..=100 {
print!("{:3}", klarner_rado[i]);
if i % 10 == 0 {
println!();
} else {
print!(" ");
}
}
println!();
let mut index = 1_000;
while index <= limit {
println!("The {}th element of Klarner-Rado sequence is {}", index, klarner_rado[index]);
index *= 10;
}
}
fn initialise_klarner_rado_sequence(limit: usize) -> Vec<usize> {
let mut result = vec![0; limit + 1];
let mut i2 = 1;
let mut i3 = 1;
let mut m2 = 1;
let mut m3 = 1;
for i in 1..=limit {
let minimum = std::cmp::min(m2, m3);
result[i] = minimum;
if m2 == minimum {
m2 = result[i2] * 2 + 1;
i2 += 1;
}
if m3 == minimum {
m3 = result[i3] * 3 + 1;
i3 += 1;
}
}
result
}
</syntaxhighlight>
{{out}}
<pre>
The first 100 elements of the Klarner-Rado sequence:
1 3 4 7 9 10 13 15 19 21
22 27 28 31 39 40 43 45 46 55
57 58 63 64 67 79 81 82 85 87
91 93 94 111 115 117 118 121 127 129
130 135 136 139 159 163 165 166 171 172
175 183 187 189 190 193 202 223 231 235
237 238 243 244 247 255 256 259 261 262
271 273 274 279 280 283 319 327 331 333
334 343 345 346 351 352 355 364 367 375
379 381 382 387 388 391 405 406 409 418
The 1000th element of Klarner-Rado sequence is 8487
The 10000th element of Klarner-Rado sequence is 157653
The 100000th element of Klarner-Rado sequence is 2911581
The 1000000th element of Klarner-Rado sequence is 54381285
</pre>
=={{header|Scala}}==
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