Commita61b451

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Refactored Set Mismatch.java to functional style

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+10

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+10

-13

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Lines changed: 10 additions & 13 deletions

Original file line number	Diff line number	Diff line change
`@@ -1,17 +1,14 @@`
	`1`	`+importjava.util.Map.Entry;`
	`2`	`+`
`1`	`3`	`classSolution {`
`2`	`4`	`publicint[]findErrorNums(int[]nums) {`
`3`		`-Map<Integer,Integer>frequency =newHashMap<>();`
`4`		`-for (intnum :nums) {`
`5`		`-frequency.put(num,frequency.getOrDefault(num,0) +1);`
`6`		`- }`
`7`		`-int[]ans =newint[2];`
`8`		`-for (intidx =1;idx <=nums.length;idx++) {`
`9`		`-if (!frequency.containsKey(idx)) {`
`10`		`-ans[1] =idx;`
`11`		`- }elseif (frequency.get(idx) >1) {`
`12`		`-ans[0] =idx;`
`13`		`- }`
`14`		`- }`
`15`		`-returnans;`
	`5`	`+HashMap<Integer,Long>frequencyMap =Arrays.stream(nums).boxed()`
	`6`	`+ .collect(Collectors.groupingBy(Function.identity(),HashMap::new,Collectors.counting()));`
	`7`	`+returnnewint[]{`
	`8`	`+frequencyMap.entrySet().stream().filter(entry ->entry.getValue().equals(2L))`
	`9`	`+ .map(Entry::getKey).findFirst().orElse(-1),`
	`10`	`+IntStream.range(1,nums.length +1).boxed().filter(key -> !frequencyMap.containsKey(key))`
	`11`	`+ .findFirst().orElse(-1)`
	`12`	`+ };`
`16`	`13`	`}`
`17`	`14`	`}`

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