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Mirage Oasis Rings

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You can think of this as a small game with a very specific goal. In Mirage Oasis Rings, you are trying to work toward the right number by following one clear idea.

Calculate mirage oasis ring pattern A good way to think about it is to first understand what goes in, then what rule you must follow, and finally what shape the answer should have.

For example, if the input is rings = 3, the answer is 40. Three rings repeat the pattern, generating forty mirrored arcs. Another example is rings = 0, which gives 1. Only the first water mirror is visible.

This is a friendly practice problem, but it still rewards careful reading. The key is understanding the rule clearly and then applying it carefully.

One helpful habit is to say the rule out loud in your own words before you start solving. If you can explain what counts, what changes, and what the final answer should look like, you are already much closer to the right solution.

Example Input & Output

Example 1
Input
rings = 3
Output
40
Explanation

Three rings repeat the pattern, generating forty mirrored arcs.

Example 2
Input
rings = 0
Output
1
Explanation

Only the first water mirror is visible.

Example 3
Input
rings = 5
Output
364
Explanation

Five rings follow the ritual, producing three hundred sixty-four shimmering reflections.

Algorithm Flow

Recommendation Algorithm Flow for Mirage Oasis Rings
Recommendation Algorithm Flow for Mirage Oasis Rings

Best Answers

java
import java.util.*;
class Solution {
    public int count_distinct_rings(int[] nums) {
        Set<Integer> set = new HashSet<>();
        for (int x : nums) set.add(x);
        return set.size();
    }
}