Tag: java8

import java.util.Set;
import java.util.stream.Collectors;
import java.util.stream.IntStream;

private static void getResult(int[] a) {
    Set set = IntStream.of(a).boxed().collect(Collectors.toSet());

    int result = 1;
    while(set.contains(result)) {
        result++;
    }

    return result;
}

Reference: https://stackoverflow.com/questions/26532081/codility-missinginteger-java