day22, part2

day22/sandSlabs.go

@@ -13,6 +13,6 @@ func Run() int {
 	space := NewSpace(byZ)
 	space.SettleAll()
 
-	result := space.ThirdTimeCountFreeBlocks()
+	result := space.CountChainReactoins()
 	return result
 }

day22/space.go

@@ -95,6 +95,31 @@ func (s *Space) ThirdTimeCountFreeBlocks() (result int) {
 	return
 }
 
+func (s *Space) CountChainReactoins() (result int) {
+	for rowNum, row := range s.SettledOnZ {
+		for blockNum, _  := range row {
+			newUnsettled := slices.Clone(s.SettledOnZ)
+			for rowNum, row := range newUnsettled {
+				newUnsettled[rowNum] = slices.Clone(row)
+			}
+			newUnsettled[rowNum] = slices.Delete(newUnsettled[rowNum], blockNum, blockNum+1)
+			// and now copy the blocks 
+			for rowNum, row := range newUnsettled {
+				for blockNum, block := range row {
+					newBlock := *block
+					newUnsettled[rowNum][blockNum] = &newBlock
+				}
+			}
+			
+			newSpace := NewSpace(newUnsettled)
+			moved := newSpace.SettleAll()
+			result += moved
+		}
+	}
+
+	return
+}
+
 func (s *Space) SettleAll() (totalMoved int) {
 	for i := uint(1); i <= s.MaxZ; i++ {
 		movedAfterLayer := s.SettleZ(i)