LeetCode 2475: Number of Unequal Triplets in Array Solution
Master LeetCode problem 2475 (Number of Unequal Triplets in Array), a easy challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.
2475. Number of Unequal Triplets in Array
Problem Explanation
Explanation
To solve this problem, we can iterate through all possible triplets (i, j, k) and check if they meet the conditions. We need to make sure that the elements at indices i, j, and k are pairwise distinct. We can achieve this by using three nested loops. If the conditions are met, we increment a counter to keep track of the number of valid triplets. Finally, we return the count of valid triplets.
- Time Complexity: O(n^3) where n is the length of the input array nums.
- Space Complexity: O(1) as we are using constant extra space.
Solution Code
class Solution {
public int countGoodTriplets(int[] nums) {
int n = nums.length;
int count = 0;
for (int i = 0; i < n; i++) {
for (int j = i + 1; j < n; j++) {
for (int k = j + 1; k < n; k++) {
if (nums[i] != nums[j] && nums[j] != nums[k] && nums[i] != nums[k]) {
count++;
}
}
}
}
return count;
}
}Try It Yourself
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