10847: ABC154 - C - Distinct or Not
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Description
Given is a sequence of integers $A_1, A_2, ..., A_N$.
If its elements are pairwise distinct, print YES; otherwise, print NO.
Input
Input is given from Standard Input in the following format:
```
$N$
$A_1$ $...$ $A_N$
```
```
$N$
$A_1$ $...$ $A_N$
```
Output
If the elements of the sequence are pairwise distinct, print YES; otherwise, print NO.
Constraints
- $2 ≤ N ≤ 200000$
- $1 ≤ A_i ≤ 10^9$
- All values in input are integers.
- $1 ≤ A_i ≤ 10^9$
- All values in input are integers.
Sample 1 Input
5
2 6 1 4 5
Sample 1 Output
YES
The elements are pairwise distinct.
Sample 2 Input
6
4 1 3 1 6 2
Sample 2 Output
NO
The second and fourth elements are identical.
Sample 3 Input
2
10000000 10000000
Sample 3 Output
NO