changes

src/main.rs

@@ -123,6 +123,7 @@ struct RoyaltyTree {
     }
 
 struct Royalty {
+    count: usize,       // Here and below
     weight: FiNum,      // Here and below
     lazy: FiNum,        // To be distributed to here and to below based on weights
     acc: FiNum,         // Accumulated here
@@ -131,7 +132,7 @@ struct Royalty {
 
 impl Royalty {
     fn new() -> Self {
-        Royalty { weight:FiNum::zero(), lazy:FiNum::zero(), acc:FiNum::zero(), order_id:0, }
+        Royalty { weight:FiNum::zero(), lazy:FiNum::zero(), acc:FiNum::zero(), order_id:0, count:0 }
         }
     }
 
@@ -147,6 +148,9 @@ impl RoyaltyTree {
     fn weight_here_below(&self, index:usize) -> FiNum {
         self.tree[index].weight
         }
+    fn count_here_below(&self, index:usize) -> usize {
+        self.tree[index].count
+        }
     fn weight_below(&self, index: usize) -> FiNum {
         if index&1==0 {
             FiNum::zero()
@@ -156,6 +160,15 @@ impl RoyaltyTree {
             w0+w1
             }
         }
+    fn count_below(&self, index: usize) -> usize {
+        if index&1==0 {
+            0
+        } else {
+            let c0=self.count_here_below(wt_left (index).unwrap());
+            let c1=self.count_here_below(wt_right(index).unwrap());
+            c0+c1
+            }
+        }
     fn weight_here(&self, index:usize) -> FiNum {
         if index&1==0 {
             self.weight_here_below(index)
@@ -165,6 +178,16 @@ impl RoyaltyTree {
             w0-w1
             }
         }
+    fn count_here(&self, index:usize) -> usize {
+        if index&1==0 {
+            self.count_here_below(index)
+        } else {
+            let c0=self.count_here_below(index);
+            let c1=self.count_below(index);
+	    if c1>c0 { println!("Count_here({}) ... c0={} c1={}",index,c0,c1) };
+            c0-c1
+            }
+        }
     fn expand_to(&mut self, index: usize) -> &mut Self {
         for _ in self.tree.len()..=index { self.tree.push(Royalty::new()) }
         self
@@ -223,6 +246,24 @@ impl RoyaltyTree {
         let weight=self.weight_here(pos);
         self.sub_weight(pos,weight);
         }
+    fn random_order_id(&self, rng: &mut rand::rngs::StdRng) -> Option<usize> {
+        if self.tree.len()==0 { return None }
+        let mut f=self.forefather();
+	while self.count_here_below(f)>0 {
+            let c0=self.count_here(f);
+	    let c1=if f&1==0 { 0 } else { self.count_here_below(wt_left(f).unwrap()) };
+	    let c2=if f&1==0 { 0 } else { self.count_here_below(wt_right(f).unwrap()) };
+	    let c=c0+c1+c2;
+	    let r=rng.gen_range(0..c);
+	    if      r<c0 { return Some(f) }
+	    else if r<c1 { f=wt_left(f).unwrap() }
+	    else         { f=wt_right(f).unwrap() }
+	    }
+	None
+        }
+    fn capture_partial(&mut self, id: usize, weight: FiNum) -> FiNum {
+        FiNum::zero()
+        }
     fn sub_weight(&mut self, index: usize, weight: FiNum) {
         self.get_royalty(index);
         let redist=self.tree[index].acc;
@@ -240,10 +281,12 @@ impl RoyaltyTree {
             let mut ff0=self.forefather();
             let ff1=wt_forefather(index);
 	    let w=self.tree[ff0].weight;
+	    let c=self.tree[ff0].count;
 	    self.expand_to(ff1*2);
 	    while ff0<ff1 {
 	        ff0=wt_parent(ff0);
 		self.tree[ff0].weight=w;
+		self.tree[ff0].count=c;
 		}
             }
 	else { self.expand_to(wt_forefather(index)*2); }
@@ -251,9 +294,11 @@ impl RoyaltyTree {
         let mut index=index;
 	let ff=self.forefather();
         while index!=ff {
+            if self.tree[index].weight==FiNum::zero() && weight>FiNum::zero() { self.tree[index].count+=1; }
             self.tree[index].weight+=weight;
             index=wt_parent(index);
             }
+        if self.tree[index].weight==FiNum::zero() && weight>FiNum::zero() { self.tree[index].count+=1; }
         self.tree[index].weight+=weight;
         }
     fn forefather(&self) -> usize {
@@ -262,7 +307,7 @@ impl RoyaltyTree {
     fn dump(&mut self) {
         for index in 0..self.tree.len() {
             let roy=self.get_royalty(index);
-            println!("Index {} Weight {} Lazy {} Acc {} Royalty {}",index,self.tree[index].weight,self.tree[index].lazy,self.tree[index].acc,roy);
+            println!("Index {} Count {} Weight {} Lazy {} Acc {} Royalty {}",index,self.tree[index].count,self.tree[index].weight,self.tree[index].lazy,self.tree[index].acc,roy);
             }
         }
     fn raw_dump(&mut self) {
@@ -749,11 +794,16 @@ fn wt_forefather(max_index:usize) -> usize {
 fn royalty_stuff() {
     let mut rng: StdRng=StdRng::seed_from_u64(13u64);
     let mut rt=RoyaltyTree::new();
-    for i in 1..1000 {
+    rt.add_weight(4,FiNum::new_i32(1));
+    rt.add_weight(5,FiNum::new_i32(1));
+    rt.dump();
+    return;
+    for i in 1..1000000 {
+        rt.dump();
         match rng.gen_range(0..10) {
-            0 => rt.add_weight(rng.gen_range(0..32),FiNum::new(rng.gen_range(0..101))),
-            1 => rt.add_royalty(FiNum::new(rng.gen_range(0..10))),
-            2 => rt.sub_royalty(FiNum::new(rng.gen_range(0..10))),
+            0 => rt.add_weight(rng.gen_range(0..8),FiNum::new_i32(rng.gen_range(0..101))),
+            1 => rt.add_royalty(FiNum::new_i32(rng.gen_range(0..10))),
+            2 => println!("Random Order ID: {:?}",rt.random_order_id(&mut rng)),
             _ => (),
 	    }
         }