FastPrep
Problem · Array

Frequency Equals Card Value

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Problem statement

You are given an integer array deck, where each integer is the value written on one card.

Return true if there is at least one integer x that appears exactly x times in deck. Otherwise, return false.

Function

hasValueWithMatchingFrequency(deck: int[]) → boolean

Examples

Example 1

deck = [1,1,1,2,2,3]return = true

The value 2 appears exactly 2 times, so the condition is satisfied.

Example 2

deck = [1,1,2,2,2,3,3]return = false

The frequencies of values 1, 2, and 3 are 2, 3, and 2. None equals its card value.

Constraints

  • 2 <= deck.length <= 10^4
  • 1 <= deck[i] <= 4 * 10^4

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public boolean hasValueWithMatchingFrequency(int[] deck) {
    // Write your code here
}
deck[1,1,1,2,2,3]
expectedtrue
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