Leetcode/src/main/java/com/fishercoder/solutions/secondthousand/_1207.java at master · fishercoder1534/Leetcode · GitHub

Name: Leetcode/src/main/java/com/fishercoder/solutions/secondthousand/_1207.java at master · fishercoder1534/Leetcode · GitHub
Rating: 4.4 (6502 reviews)
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packagecom.fishercoder.solutions.secondthousand;

importjava.util.Arrays;
importjava.util.HashMap;
importjava.util.HashSet;
importjava.util.Map;
importjava.util.Set;

publicclass_1207 {
publicstaticclassSolution1 {
publicbooleanuniqueOccurrences(int[] arr) {
Map<Integer, Integer> map = newHashMap<>();
Arrays.stream(arr)
 .forEach(
num -> {
map.put(num, map.containsKey(num) ? map.get(num) + 1 : 1);
 });
Set<Integer> set = newHashSet<>();
returnmap.keySet().stream()
 .mapToInt(key -> key)
 .allMatch(key -> set.add(map.get(key)));
 }
 }
}