2177. Find Three Consecutive Integers That Sum to a Given Number 

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class Solution {
    public long[] sumOfThree(long num) {
        if (num % 3 != 0) {
            return new long[0];
        }

        long b = num / 3;
        long a = b - 1, c = b + 1;
        return new long[]{a, b, c};
    }
}

References

2177. Find Three Consecutive Integers That Sum to a Given Number