diff --git a/NPoS/auctiondynamicthing.py b/NPoS/auctiondynamicthing.py
new file mode 100644
index 0000000..a99b317
--- /dev/null
+++ b/NPoS/auctiondynamicthing.py
@@ -0,0 +1,47 @@
+class auction:
+    def __init__(self):
+        #Note that ranges are intervals not slices;
+        #the lenth 1 range has start=end not end=start+1
+        self.ranges = [(start,end) for end in range(4) for start in range(end+1)]
+        self.winningbidsonranges=[(None,0) for _ in self.ranges]
+    def bid(self,bidid,start,end,amount,verbose=False):
+        if verbose:
+            print(bidid," bids ",amount," on [",start,",",end,"]")
+        #Bid should intersect with all winning bids by same bidder
+        for rangeotherbid in [i for i,w in zip(self.ranges,self.winningbidsonranges) if w[0]==bidid]:
+            if rangeotherbid[0] > end or rangeotherbid[1] < start:
+                if verbose:
+                    print("Invalid bid as winning on [",rangeotherbid[0],",",rangeotherbid[1],"]")
+                return
+        rangeindex=self.ranges.index((start,end))
+        _,currentwinningbid=self.winningbidsonranges[rangeindex]
+        if amount > currentwinningbid:
+            self.winningbidsonranges[rangeindex] = (bidid,amount)
+    def bestbidonrangeandvalue(self,start,end):
+        rangeindex=self.ranges.index((start,end))
+        return ((self.winningbidsonranges[rangeindex][0],start,end), self.winningbidsonranges[rangeindex][1]*(end-start+1))
+    def calculatewinners(self):
+        bestwinnersendingat=[([],0) for _ in range(4)]
+        for i in range(4):
+            bidderrange,value=self.bestbidonrangeandvalue(0,i)
+            bestwinnersendingat[i]=([bidderrange],value)
+            for j in range(i):
+                bidderrange,value = self.bestbidonrangeandvalue(j+1,i)
+                value += bestwinnersendingat[j][1]
+                if value > bestwinnersendingat[i][1]:
+                    newwinners=bestwinnersendingat[j][0]+[bidderrange]
+                    bestwinnersendingat[i]=(newwinners,value)
+        return bestwinnersendingat[3]
+def example1():
+    a=auction()
+    a.bid("x",0,3,1,True)
+    a.bid("a",0,0,2,True)
+    a.bid("a",1,1,53,True)
+    a.bid("b",1,1,1,True)
+    a.bid("c",2,2,1,True)
+    a.bid("d",3,3,1,True)
+    print(a.calculatewinners())
+    a.bid("x",0,3,2,True)
+    print(a.calculatewinners())
+    
+