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ab90e9c219
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f826f2b2d3
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package main
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import "fmt"
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func main() {
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res := canVisitAllRooms([][]int{{1}, {2}, {}})
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fmt.Printf("%+v\n", res)
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}
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func canVisitAllRooms(rooms [][]int) bool {
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if len(rooms) > 0 && len(rooms[0]) == 0 {
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return false
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}
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keys := getAllKeys(0, make(map[int]struct{}), rooms)
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keys[0] = struct{}{}
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for i := 0; i < len(rooms); i++ {
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if _, ok := keys[i]; !ok {
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return false
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}
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}
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return true
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}
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func getAllKeys(index int, seen map[int]struct{}, rooms [][]int) map[int]struct{} {
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keys := map[int]struct{}{}
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for j := 0; j < len(rooms[index]); j++ {
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if _, ok := keys[rooms[index][j]]; ok {
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continue
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}
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keys[rooms[index][j]] = struct{}{}
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insideKeys := getAllKeys(j, keys, rooms)
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for k := range insideKeys {
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keys[k] = struct{}{}
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}
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}
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return keys
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}
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@ -1,18 +0,0 @@
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{-
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n! means n x (n - 1) x ... x 3 x 2 x 1.
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For example, 10! = 10 x 9 x ... x 3 x 2 x 1 = 3628800,
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and the sum of the digits in the number 10! is 3 + 6 + 2 + 8 + 8 + 0 + 0 = 27.
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Find the sum of the digits in the number 100!.
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-}
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import Data.Char (digitToInt)
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read' :: Integer -> String
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read' = show
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main :: IO ()
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main = do
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print $ "Answer: " <> show ans
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ans :: Int
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ans = sum $ map digitToInt $ read' $ product [1..100]
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