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16.go
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16.go
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package bfs
import (
"fmt"
"log"
)
type Metro struct {
N, M, source, target int
metro, stationToLine [][]int
}
func (m *Metro) inputFunc() {
inputNumber := func() int {
var number int
_, err := fmt.Scan(&number)
if err != nil {
log.Fatal(err)
}
return number
}
inputArr := func(lenArr int) []int {
var arr = make([]int, lenArr)
for i := 0; i < len(arr); i++ {
_, err := fmt.Scan(&arr[i])
if err != nil {
log.Fatal(err)
}
}
return arr
}
m.N, m.M = inputNumber(), inputNumber()
m.metro = make([][]int, m.M+1)
m.stationToLine = make([][]int, m.N+1)
for i := 1; i <= m.M; i++ {
sc := inputNumber()
stations := inputArr(sc)
m.metro[i] = stations
for _, s := range stations {
if m.stationToLine[s] == nil {
m.stationToLine[s] = []int{i}
} else {
m.stationToLine[s] = append(m.stationToLine[s], i)
}
}
}
m.source, m.target = inputNumber(), inputNumber()
}
func (m *Metro) outputFunc() {
targetLines := m.stationToLine[m.target]
findMap := make(map[int]struct{})
for _, line := range targetLines {
findMap[line] = struct{}{}
}
metroToCount := make([]int, m.M+1)
visited := make([]bool, m.M+1)
output := true
queue := m.stationToLine[m.source]
for _, line := range queue {
visited[line] = true
}
for len(queue) > 0 {
line := queue[0]
queue = queue[1:]
if _, ok := findMap[line]; ok {
fmt.Println(metroToCount[line])
output = false
break
}
for _, station := range m.metro[line] {
if len(m.stationToLine[station]) > 1 {
for _, newLine := range m.stationToLine[station] {
if !visited[newLine] {
visited[newLine] = true
queue = append(queue, newLine)
if metroToCount[newLine] != 0 {
metroToCount[newLine] = min(metroToCount[newLine], metroToCount[line]+1)
} else {
metroToCount[newLine] = metroToCount[line] + 1
}
}
}
}
}
}
if output {
fmt.Println(-1)
}
}
func MetroProcessing() {
solution := &Metro{}
solution.inputFunc()
solution.outputFunc()
}