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| // @Title: 账户合并 (Accounts Merge)
// @Author: 15816537946@163.com
// @Date: 2021-01-18 22:30:42
// @Runtime: 60 ms
// @Memory: 9.3 MB
func accountsMerge(accounts [][]string) [][]string {
emailToIndex := map[string]int{}
emailToName := map[string]string{}
for _, account := range accounts {
name := account[0]
for _, email := range account[1:] {
if _, has := emailToIndex[email]; !has {
emailToIndex[email] = len(emailToIndex)
emailToName[email] = name
}
}
}
parent := make([]int, len(emailToIndex))
for i := range parent {
parent[i] = i
}
var find func(int) int
find = func(x int) int {
if parent[x] != x {
parent[x] = find(parent[x])
}
return parent[x]
}
union := func(from, to int) {
parent[find(from)] = find(to)
}
for _, account := range accounts {
firstIndex := emailToIndex[account[1]]
for _, email := range account[2:] {
union(emailToIndex[email], firstIndex)
}
}
indexToEmails := map[int][]string{}
for email, index := range emailToIndex {
index = find(index)
indexToEmails[index] = append(indexToEmails[index], email)
}
var ans [][]string
for _, emails := range indexToEmails {
sort.Strings(emails)
account := append([]string{emailToName[emails[0]]}, emails...)
ans = append(ans, account)
}
return ans
}
|