import "os"
import "strings"
+var funds = flag.Int("funds", 0,
+ "Starting funds")
+
var start = flag.String("start", "",
"The planet to start at")
func DimensionSizes(data planet_data) []int {
eden_capacity := data.Commodities["Eden Warp Units"].Limit
+ if *start_edens > eden_capacity {
+ eden_capacity = *start_edens
+ }
cloak_capacity := bint(*cloak)
dims := make([]int, NumDimensions)
dims[Edens] = eden_capacity + 1
if addr[0] > dims[0] {
panic(0)
}
- for i := 1; i < len(dims); i++ {
+ for i := 1; i < NumDimensions; i++ {
if addr[i] > dims[i] {
panic(i)
}
}
func DecodeIndex(dims []int, index int) []int {
- addr := make([]int, len(dims))
- for i := len(dims) - 1; i > 0; i-- {
+ addr := make([]int, NumDimensions)
+ for i := NumDimensions - 1; i > 0; i-- {
addr[i] = index % dims[i]
index /= dims[i]
}
return addr
}
-func InitializeStateTable(data planet_data, dims []int, table []State) {
+func InitializeStateTable(data planet_data, dims []int) []State {
+ table := make([]State, StateTableSize(dims))
+
+ addr := make([]int, NumDimensions)
+ addr[Fuel] = *fuel
+ addr[Edens] = *start_edens
+ addr[Location] = data.p2i[*start]
+ table[EncodeIndex(dims, addr)].value = *funds
+
+ return table
}
-/* Fill in the cell at address addr by looking at all the possible ways
- * to reach this cell and selecting the best one.
+/* These four fill procedures fill in the cell at address addr by
+ * looking at all the possible ways to reach this cell and selecting
+ * the best one.
*
* The other obvious implementation choice is to do this the other way
* around -- for each cell, conditionally overwrite all the other cells
* that are reachable *from* the considered cell. We choose gathering
* reads over scattering writes to avoid having to take a bunch of locks.
- *
- * The order that we check things here matters only for value ties. We
- * keep the first best path. So when action order doesn't matter, the
- * check that is performed first here will appear in the output first.
*/
-func FillStateTableCell(data planet_data, dims []int, table []State, addr []int) {
+
+func UpdateCell(table []State, here, there, value_difference int) {
+ possible_value := table[there].value + value_difference
+ if table[there].value > 0 && possible_value > table[here].value {
+ table[here].value = possible_value
+ table[here].from = there
+ }
+}
+
+func FillCellByArriving(data planet_data, dims []int, table []State, addr []int) {
my_index := EncodeIndex(dims, addr)
other := make([]int, NumDimensions)
copy(other, addr)
/* Travel here via a 2-fuel unit jump */
- if addr[Fuel] + 2 < dims[Fuel] {
+ if addr[Fuel]+2 < dims[Fuel] {
other[Fuel] = addr[Fuel] + 2
- for p := 0; p < dims[Location]; p++ {
- other[Location] = p
- if table[EncodeIndex(dims, other)].value > table[my_index].value {
- table[my_index].value = table[EncodeIndex(dims, other)].value
- table[my_index].from = EncodeIndex(dims, other)
- }
+ for other[Location] = 0; other[Location] < dims[Location]; other[Location]++ {
+ UpdateCell(table, my_index, EncodeIndex(dims, other), 0)
}
other[Location] = addr[Location]
other[Fuel] = addr[Fuel]
}
/* Travel here via a hidey hole */
- if addr[Fuel] + 1 < dims[Fuel] {
+ if addr[Fuel]+1 < dims[Fuel] {
hole_index := (dims[Fuel] - 1) - (addr[Fuel] + 1)
if hole_index < len(flight_plan()) {
other[Fuel] = addr[Fuel] + 1
other[Location] = data.p2i[flight_plan()[hole_index]]
- if table[EncodeIndex(dims, other)].value > table[my_index].value {
- table[my_index].value = table[EncodeIndex(dims, other)].value
- table[my_index].from = EncodeIndex(dims, other)
- }
+ UpdateCell(table, my_index, EncodeIndex(dims, other), 0)
+ other[Location] = addr[Location]
other[Fuel] = addr[Fuel]
}
}
/* Travel here via Eden Warp Unit */
- /* Silly: Dump Eden warp units */
+ for other[Edens] = addr[Edens] + 1; other[Edens] < dims[Edens]; other[Edens]++ {
+ for other[Location] = 0; other[Location] < dims[Location]; other[Location]++ {
+ UpdateCell(table, my_index, EncodeIndex(dims, other), 0)
+ }
+ }
+ other[Location] = addr[Location]
+ other[Edens] = addr[Edens]
+}
+
+func FillCellBySelling(data planet_data, dims []int, table []State, addr []int) {
+ if addr[Hold] > 0 {
+ // Can't sell and still have cargo
+ return
+ }
+ if addr[UnusedCargo] > 0 {
+ // Can't sell everything and still have 'unused' holds
+ return
+ }
+ my_index := EncodeIndex(dims, addr)
+ other := make([]int, NumDimensions)
+ copy(other, addr)
+ planet := data.i2p[addr[Location]]
+ for other[Hold] = 0; other[Hold] < dims[Hold]; other[Hold]++ {
+ commodity := data.i2c[other[Hold]]
+ if !data.Commodities[commodity].CanSell {
+ // TODO: Dump cargo
+ continue
+ }
+ relative_price, available := data.Planets[planet].RelativePrices[commodity]
+ if !available {
+ continue
+ }
+ base_price := data.Commodities[commodity].BasePrice
+ absolute_price := relative_price * base_price
+ sell_price := int(float64(absolute_price) * 0.9)
+
+ for other[UnusedCargo] = 0; other[UnusedCargo] < dims[UnusedCargo]; other[UnusedCargo]++ {
+
+ quantity := *hold - other[UnusedCargo] // TODO: Partial sales
+ sale_value := quantity * sell_price
+ UpdateCell(table, my_index, EncodeIndex(dims, other), sale_value)
+ }
+ }
+ other[UnusedCargo] = addr[UnusedCargo]
+}
+
+func FillCellByBuying(data planet_data, dims []int, table []State, addr []int) {
+ if addr[Hold] == 0 {
+ // Can't buy and then have nothing
+ return
+ }
+ my_index := EncodeIndex(dims, addr)
+ other := make([]int, NumDimensions)
+ copy(other, addr)
+ planet := data.i2p[addr[Location]]
+ commodity := data.i2c[addr[Hold]]
+ if !data.Commodities[commodity].CanSell {
+ return
+ }
+ relative_price, available := data.Planets[planet].RelativePrices[commodity]
+ if !available {
+ return
+ }
+ base_price := data.Commodities[commodity].BasePrice
+ absolute_price := relative_price * base_price
+ quantity := *hold - addr[UnusedCargo]
+ total_price := quantity * absolute_price
+ other[Hold] = 0
+ UpdateCell(table, my_index, EncodeIndex(dims, other), -total_price)
+}
+
+func FillCellByMisc(data planet_data, dims []int, table []State, addr []int) {
/* Buy Eden warp units */
/* Buy a Device of Cloaking */
/* Silly: Dump a Device of Cloaking */
/* Buy Fighter Drones */
/* Buy Shield Batteries */
- if addr[Hold] == 0 {
- /* Sell or dump things */
- // for commodity := range data.Commodities { }
- } else {
- /* Buy this thing */
- }
/* Visit this planet */
}
-func FillStateTable2(data planet_data, dims []int, table []State,
-fuel_remaining, edens_remaining int, planet string, barrier chan<- bool) {
- /* The dimension nesting order up to this point is important.
- * Beyond this point, it's not important.
- *
- * It is very important when iterating through the Hold dimension
- * to visit the null commodity (empty hold) first. Visiting the
- * null commodity represents selling. Visiting it first gets the
- * action order correct: arrive, sell, buy, leave. Visiting the
- * null commodity after another commodity would evaluate the action
- * sequence: arrive, buy, sell, leave. This is a useless action
- * sequence. Because we visit the null commodity first, we do not
- * consider these action sequences.
- */
- eden_capacity := data.Commodities["Eden Warp Units"].Limit
- addr := make([]int, len(dims))
- addr[Edens] = edens_remaining
- addr[Fuel] = fuel_remaining
- addr[Location] = data.p2i[planet]
+func FillStateTable2Iteration(data planet_data, dims []int, table []State,
+addr []int, f func(planet_data, []int, []State, []int)) {
+ /* TODO: Justify the safety of the combination of this dimension
+ * iteration and the various phases f. */
for addr[Hold] = 0; addr[Hold] < dims[Hold]; addr[Hold]++ {
for addr[Cloaks] = 0; addr[Cloaks] < dims[Cloaks]; addr[Cloaks]++ {
for addr[UnusedCargo] = 0; addr[UnusedCargo] < dims[UnusedCargo]; addr[UnusedCargo]++ {
- if addr[Edens]+addr[Cloaks]+addr[UnusedCargo] <=
- eden_capacity+1 {
- for addr[NeedFighters] = 0; addr[NeedFighters] < dims[NeedFighters]; addr[NeedFighters]++ {
- for addr[NeedShields] = 0; addr[NeedShields] < dims[NeedShields]; addr[NeedShields]++ {
- for addr[Visit] = 0; addr[Visit] < dims[Visit]; addr[Visit]++ {
- FillStateTableCell(data, dims, table, addr)
- }
+ for addr[NeedFighters] = 0; addr[NeedFighters] < dims[NeedFighters]; addr[NeedFighters]++ {
+ for addr[NeedShields] = 0; addr[NeedShields] < dims[NeedShields]; addr[NeedShields]++ {
+ for addr[Visit] = 0; addr[Visit] < dims[Visit]; addr[Visit]++ {
+ f(data, dims, table, addr)
}
}
}
}
}
}
+}
+
+func FillStateTable2(data planet_data, dims []int, table []State,
+fuel_remaining, edens_remaining int, planet string, barrier chan<- bool) {
+ addr := make([]int, len(dims))
+ addr[Edens] = edens_remaining
+ addr[Fuel] = fuel_remaining
+ addr[Location] = data.p2i[planet]
+ FillStateTable2Iteration(data, dims, table, addr, FillCellByArriving)
+ FillStateTable2Iteration(data, dims, table, addr, FillCellBySelling)
+ FillStateTable2Iteration(data, dims, table, addr, FillCellByBuying)
+ FillStateTable2Iteration(data, dims, table, addr, FillCellByMisc)
barrier <- true
}
print("\n")
}
-/* What is the value of hauling 'commodity' from 'from' to 'to'?
- * Take into account the available funds and the available cargo space. */
-func TradeValue(data planet_data,
-from, to Planet,
-commodity string,
-initial_funds, max_quantity int) int {
- if !data.Commodities[commodity].CanSell {
- return 0
- }
- from_relative_price, from_available := from.RelativePrices[commodity]
- if !from_available {
- return 0
- }
- to_relative_price, to_available := to.RelativePrices[commodity]
- if !to_available {
- return 0
- }
-
- base_price := data.Commodities[commodity].BasePrice
- from_absolute_price := from_relative_price * base_price
- to_absolute_price := to_relative_price * base_price
- buy_price := from_absolute_price
- sell_price := int(float64(to_absolute_price) * 0.9)
- var can_afford int = initial_funds / buy_price
- quantity := can_afford
- if quantity > max_quantity {
- quantity = max_quantity
+func FindBestState(data planet_data, dims []int, table []State) int {
+ addr := make([]int, NumDimensions)
+ addr[Edens] = *end_edens
+ addr[Cloaks] = dims[Cloaks] - 1
+ addr[NeedFighters] = dims[NeedFighters] - 1
+ addr[NeedShields] = dims[NeedShields] - 1
+ addr[Visit] = dims[Visit] - 1
+ // Fuel, Hold, UnusedCargo left at 0
+ var max_index int
+ max_value := 0
+ for addr[Location] = 0; addr[Location] < dims[Location]; addr[Location]++ {
+ index := EncodeIndex(dims, addr)
+ if table[index].value > max_value {
+ max_value = table[index].value
+ max_index = index
+ }
}
- return (sell_price - buy_price) * max_quantity
+ return max_index
}
-func FindBestTrades(data planet_data) [][]string {
- // TODO: We can't cache this because this can change based on available funds.
- best := make([][]string, len(data.Planets))
- for from := range data.Planets {
- best[data.p2i[from]] = make([]string, len(data.Planets))
- for to := range data.Planets {
- best_gain := 0
- price_list := data.Planets[from].RelativePrices
- if len(data.Planets[to].RelativePrices) < len(data.Planets[from].RelativePrices) {
- price_list = data.Planets[to].RelativePrices
+func DescribePath(data planet_data, dims []int, table []State, start int) (description []string) {
+ for index := start; index > 0 && table[index].from > 0; index = table[index].from {
+ line := fmt.Sprintf("%10v", table[index].value)
+ addr := DecodeIndex(dims, index)
+ prev := DecodeIndex(dims, table[index].from)
+ if addr[Location] != prev[Location] {
+ from := data.i2p[prev[Location]]
+ to := data.i2p[addr[Location]]
+ if addr[Fuel] != prev[Fuel] {
+ line += fmt.Sprintf(" Jump from %v to %v (%v reactor units)", from, to, prev[Fuel]-addr[Fuel])
+ } else if addr[Edens] != prev[Edens] {
+ line += fmt.Sprintf(" Eden warp from %v to %v", from, to)
+ } else {
+ panic("Traveling without fuel?")
}
- for commodity := range price_list {
- gain := TradeValue(data,
- data.Planets[from],
- data.Planets[to],
- commodity,
- 10000000,
- 1)
- if gain > best_gain {
- best[data.p2i[from]][data.p2i[to]] = commodity
- gain = best_gain
- }
+ }
+ if addr[Hold] != prev[Hold] {
+ if addr[Hold] == 0 {
+ quantity := *hold - (prev[UnusedCargo] + prev[Edens] + prev[Cloaks])
+ line += fmt.Sprintf(" Sell %v %v", quantity, data.i2c[prev[Hold]])
+ } else if prev[Hold] == 0 {
+ quantity := *hold - (addr[UnusedCargo] + addr[Edens] + addr[Cloaks])
+ line += fmt.Sprintf(" Buy %v %v", quantity, data.i2c[addr[Hold]])
+ } else {
+ panic("Switched cargo?")
}
+
}
+ description = append(description, line)
}
- return best
+ return
}
// (Example of a use case for generics in Go)
data.p2i, data.i2p = IndexPlanets(&data.Planets, 0)
data.c2i, data.i2c = IndexCommodities(&data.Commodities, 1)
dims := DimensionSizes(data)
- table := make([]State, StateTableSize(dims))
- InitializeStateTable(data, dims, table)
+ table := InitializeStateTable(data, dims)
FillStateTable1(data, dims, table)
- print("Going to print state table...")
- fmt.Printf("%v", table)
- best_trades := FindBestTrades(data)
-
- for from := range data.Planets {
- for to := range data.Planets {
- best_trade := "(nothing)"
- if best_trades[data.p2i[from]][data.p2i[to]] != "" {
- best_trade = best_trades[data.p2i[from]][data.p2i[to]]
- }
- fmt.Printf("%s to %s: %s\n", from, to, best_trade)
- }
+ best := FindBestState(data, dims, table)
+ fmt.Printf("Best state: %v (%v) with $%v\n",
+ best, DecodeIndex(dims, best), table[best].value)
+ description := DescribePath(data, dims, table, best)
+ for i := len(description) - 1; i >= 0; i-- {
+ print(description[i], "\n")
}
}
projects / planeteer / blobdiff