Data update

Task/Recamans-sequence/Rust/recamans-sequence.rust

@@ -0,0 +1,27 @@
+use std::collections::HashSet ;
+
+fn main() {
+   let mut recamans : Vec<i32> = Vec::new( ) ;
+   let mut reca_set : HashSet<i32> = HashSet::new() ;
+   let mut first_nums : HashSet<i32> = HashSet::new( ) ;
+   for i in 0i32..=1000 {
+      first_nums.insert( i ) ;
+   }
+   recamans.push( 0 ) ;
+   reca_set.insert( 0 ) ;
+   let mut current : i32 = 0 ;
+   while ! first_nums.is_subset( &reca_set ) {
+      current += 1 ;
+      let mut nextnum : i32 = recamans[( current as usize ) - 1] - current ;
+      if nextnum < 0 || reca_set.contains( &nextnum ) {
+         nextnum = recamans[(current as usize ) - 1 ] + current ;
+      }
+      recamans.push( nextnum ) ;
+      reca_set.insert( nextnum ) ;
+      if current == 15 {
+         println!("The first 15 numbers of the Recaman sequence are:" ) ;
+         println!("{:?}" , recamans ) ;
+      }
+   }
+   println!("To generate all numbers from 0 to 1000 , one has to go to element {}" , current) ;
+}