No Two Counts Alike

Easy

You get an integer array values. For every distinct value, count how many times it occurs. Return True if all these counts are pairwise different, and False if at least two values occur the same number of times.

Example 1

values=[4, 7, 7, 4, 4, 9] → True

4 occurs 3 times, 7 twice, 9 once. All counts differ.

Example 2

values=[1, 2, 2, 1] → False

Both 1 and 2 occur twice.

Constraints

1 ≤ len(values) ≤ 1000
-1000 ≤ values[i] ≤ 1000

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Topics

Array Hash Table

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Input

values=[4, 7, 7, 4, 4, 9]

Expected

True

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