Create 0332-reconstruct-itenerary.go

Author: kkr2

go/0332-reconstruct-itenerary.go

@@ -0,0 +1,48 @@
+func findItinerary(tickets [][]string) []string {
+
+	adjMap := make(map[string][]string)
+
+	for i := 0; i < len(tickets); i++ {
+		adjMap[tickets[i][0]] = append(adjMap[tickets[i][0]], tickets[i][1])
+	}
+
+	for i := 0; i < len(tickets); i++ {
+		sort.Strings(adjMap[tickets[i][0]])
+	}
+
+	res := []string{"JFK"}
+
+	var dfs func(source string) bool
+
+	dfs = func(src string) bool {
+
+		if len(res) == len(tickets)+1 {
+			return true
+		}
+
+		if _, ok := adjMap[src]; !ok {
+			return false
+		}
+
+		destinationList := adjMap[src]
+
+		for i, destination := range destinationList {
+
+			adjMap[src] = append(adjMap[src][:i], adjMap[src][i+1:]...)
+
+			res = append(res, destination)
+			if dfs(destination) == true {
+				return true
+			}
+			adjMap[src] = append(adjMap[src][:i+1], adjMap[src][i:]...)
+			adjMap[src][i] = destination
+
+			res = res[:len(res)-1]
+		}
+
+		return false
+	}
+
+	dfs("JFK")
+	return res
+}