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_811.java
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_811.java
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import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* LeetCode 811 - Subdomain Visit Count
*/
public class _811 {
public List<String> subdomainVisits(String[] cpdomains) {
Map<String, Integer> map = new HashMap<>();
for (String cpdomain : cpdomains) {
String[] tokens = cpdomain.split("[ ]+");
int cnt = Integer.parseInt(tokens[0].trim());
String domain = tokens[1].trim();
for (int i = 0; i < domain.length(); i++) {
if (domain.charAt(i) == '.') {
String subdomain = domain.substring(i + 1);
map.put(subdomain, map.getOrDefault(subdomain, 0) + cnt);
}
}
map.put(domain, map.getOrDefault(domain, 0) + cnt);
}
List<String> ans = new ArrayList<>();
for (String key : map.keySet()) {
ans.add(String.format("%d %s", map.get(key), key));
}
return ans;
}
}