The Two Missing Numbers

Difficulty: 1400 2000 ms 128 MB

math

The list should contain 1..N but exactly TWO numbers are missing. Print them in increasing order.

Input: the first line has N; the second line has the N−2 remaining numbers.

Output: the two missing numbers, ascending.

Constraints:

• 3 ≤ N ≤ 10⁵

Sample Tests

5
2 4 5

1 3

3
2

1 3

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