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721.java
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721.java
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__________________________________________________________________________________________________
sample 19 ms submission
class Solution {
Map<String, Integer> map = new HashMap<>();
private int[] iParent;
public List<List<String>> accountsMerge(List<List<String>> accounts) {
List<List<String>> res = new ArrayList<>();
iParent = new int[accounts.size()];
for(int i = 0;i<iParent.length;i++)
iParent[i] = i;
int j = 0;
for(List<String> acc:accounts){
for(int i = 1, l = acc.size();i<l;i++){
Integer v = map.putIfAbsent(acc.get(i),j);
if(v != null)
union(v,j);
}
j++;
}
ArrayList<String>[] d= new ArrayList[accounts.size()];
for(Map.Entry<String, Integer> e:map.entrySet())
{
int inx = getParent(e.getValue());
if(d[inx] == null) {
d[inx] = new ArrayList<>();
//d[inx].add(accounts.get(inx).get(0));
}
d[inx].add(e.getKey());
}
for (int i = 0; i < d.length; i++) {
if(d[i] != null){
List<String> l = new ArrayList<>();
l.add(accounts.get(i).get(0));
Collections.sort(d[i]);
l.addAll(d[i]);
res.add(l);
}
}
return res;
}
private void union(int v, int j){
iParent[getParent(j)] = getParent(v);
}
private int getParent(int j){
int p = iParent[j];
while(p != iParent[p]){
p = iParent[p];
iParent[j] = p;
}
return p;
}
}
__________________________________________________________________________________________________
sample 41764 kb submission
class Solution {
public List<List<String>> accountsMerge(List<List<String>> accounts) {
List<List<String>> rst = new ArrayList<List<String>>();
if (accounts == null || accounts.size() == 0) {
return rst;
}
Map<String, String> owner = new HashMap<String, String>();
Map<String, String> parent = new HashMap<String, String>();
Map<String, TreeSet<String>> union = new HashMap<String, TreeSet<String>>();
for (List<String> list : accounts) {
for (int i = 1; i < list.size(); ++i) {
parent.put(list.get(i), list.get(1));
owner.put(list.get(i), list.get(0));
}
}
for (List<String> list : accounts) {
String key = find(list.get(1), parent);
for (int i = 2; i < list.size(); ++i) {
parent.put(find(list.get(i), parent), key);
}
}
for (List<String> list : accounts) {
String key = find(list.get(1), parent);
for (int i = 1; i < list.size(); ++i) {
union.computeIfAbsent(key, t->new TreeSet<String>()).add(list.get(i));
}
}
for (String key : union.keySet()) {
List<String> email = new ArrayList<String>(union.get(key));
email.add(0, owner.get(key));
rst.add(email);
}
return rst;
}
private String find(String str, Map<String, String> map) {
if (map.get(str) != str) {
map.put(str, find(map.get(str), map));
}
return map.get(str);
}
}
__________________________________________________________________________________________________