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import java.util.Arrays; | |
import java.util.Collections; | |
import java.util.HashMap; | |
import java.util.HashSet; | |
import java.util.Map; | |
import java.util.Set; | |
import java.util.stream.Collectors; | |
import java.util.stream.Stream; | |
class Data { | |
Map<String, Set<String>> value; | |
public Data() { | |
value = new HashMap<>(); | |
} | |
} | |
public class LaLa { | |
Set<Data> dataSet; | |
/* | |
Input | |
[ | |
{ | |
"1": ["A", "B"], | |
"2": ["A", "C", "D"] | |
}, | |
{ | |
"1": ["A", "C"], | |
"3": ["D"] | |
}, | |
{ | |
"1": ["B", "C"], | |
"4": ["A"] | |
} | |
] | |
Output | |
{ | |
"A": ["1", "2", "4"], | |
"B": ["1"], | |
"C": ["1", "2"], | |
"D": ["2", "3"] | |
} | |
*/ | |
private void putToData(Data data, String key, String... values) { | |
Set<String> value = Arrays.stream(values).collect(Collectors.toSet()); | |
data.value.put(key, value); | |
} | |
public void initDataSet() { | |
dataSet = new HashSet<>(); | |
Data data = new Data(); | |
putToData(data, "1", "A", "B"); | |
putToData(data, "2", "A", "C", "D"); | |
dataSet.add(data); | |
data = new Data(); | |
putToData(data, "1", "A", "C"); | |
putToData(data, "3", "D"); | |
dataSet.add(data); | |
data = new Data(); | |
putToData(data, "1", "B", "C"); | |
putToData(data, "4", "A"); | |
dataSet.add(data); | |
} | |
public void printData() { | |
System.out.println("Original data:"); | |
dataSet.forEach(data -> { | |
data.value.forEach((k, v) -> { | |
System.out.printf("%s: %s\n", k, v.toString()); | |
}); | |
System.out.println("-----"); | |
}); | |
} | |
public void printSolved(Map<String, Set<String>> solvedData) { | |
System.out.println("Solved data:"); | |
solvedData.forEach((k, v) -> System.out.printf("%s: %s\n", k, v.toString())); | |
} | |
public Map<String, Set<String>> solve() { | |
return dataSet.stream().map(data -> data.value.entrySet().stream() | |
.map(e -> e.getValue().stream().map(v -> Collections.singletonMap(v, Stream.of(e.getKey()).collect(Collectors.toSet()))) | |
.map(HashMap::new) | |
.reduce((m1, m2) -> { | |
m2.entrySet().forEach(es -> { | |
if (m1.get(es.getKey()) == null) { | |
m1.put(es.getKey(), es.getValue()); | |
} else { | |
m1.get(es.getKey()).addAll(es.getValue()); | |
} | |
}); | |
return m1; | |
}).get() | |
).reduce((m1, m2) -> { | |
m2.entrySet().forEach(es -> { | |
if (m1.get(es.getKey()) == null) { | |
m1.put(es.getKey(), es.getValue()); | |
} else { | |
m1.get(es.getKey()).addAll(es.getValue()); | |
} | |
}); | |
return m1; | |
}).get() | |
).reduce((m1, m2) -> { | |
m2.entrySet().forEach(es -> { | |
if (m1.get(es.getKey()) == null) { | |
m1.put(es.getKey(), es.getValue()); | |
} else { | |
m1.get(es.getKey()).addAll(es.getValue()); | |
} | |
}); | |
return m1; | |
}).get(); | |
} | |
public static void main(String[] args) { | |
LaLa lala = new LaLa(); | |
lala.initDataSet(); | |
lala.printData(); | |
Map<String, Set<String>> solved = lala.solve(); | |
lala.printSolved(solved); | |
} | |
} |
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