d

```
/**
* Author : Siddhant Swarup Mallick
* Github : https://github.com/siddhant2002
*/
/**
* In mathematics, the Golomb sequence is a non-decreasing integer sequence where n-th term is equal
* to number of times n appears in the sequence.
*/
/**
* Wikipedia Link - https://en.wikipedia.org/wiki/Golomb_sequence
*/
/** Program description - To find the Golomb sequence upto n */
package com.thealgorithms.dynamicprogramming;
public final class CountFriendsPairing {
private CountFriendsPairing() {
}
public static boolean countFriendsPairing(int n, int[] a) {
int[] dp = new int[n + 1];
// array of n+1 size is created
dp[0] = 1;
// since 1st index position value is fixed so it's marked as 1
for (int i = 1; i < n; i++) {
dp[i] = 1 + dp[i - dp[dp[i - 1]]];
// formula for ith golomb sequence is dp(i) = 1 + dp(i – dp(dp(i - 1)))
}
for (int i = 1; i < n; i++) {
if (a[i - 1] != dp[i]) {
return false;
// checks whether the calculated answer matches with the expected answer
}
}
return true;
// returns true if calculated answer matches with the expected answer
}
}
```