Nothing

```
findleafs<-function(left,right)
{
# Finds location of leafs in binary tree, living in vector
# left, right are itemnum-vectors
# returns itemnum-vector, 1 in the location of nodes 0 non-terminal
# NA in positions not belonging to tree
# vector where binary tree is living may be larger than cardinality
# of nodes of the tree
itemnum<-length(left)
leafloc<-matrix(NA,itemnum,1)
pino<-matrix(0,itemnum,1)
pino[1]<-1 #pino[1]<-root
pinin<-1
while (pinin>0){
cur<-pino[pinin] #take from stack
pinin<-pinin-1
if (left[cur]==0){ #if we are in leaf
leafloc[cur]<-1
}
else{
while (left[cur]>0){ #go to leaf and put right nodes to stack
leafloc[cur]<-0
pinin<-pinin+1
pino[pinin]<-right[cur]
cur<-left[cur]
}
leafloc[cur]<-1 #now we know we are in leaf
}
}
return(leafloc)
}
```

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