LeetCode 1133: Largest Unique Number Solution

Master LeetCode problem 1133 (Largest Unique Number), 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.

1133. Largest Unique Number

Easy

Array Hash Table Sorting

Problem Explanation

Explanation:

To solve this problem, we need to find the largest integer in the given array that occurs only once. We can achieve this by iterating through the array, counting the occurrences of each number, and then finding the largest number that occurs exactly once.

Create a HashMap to store the count of each number in the array.
Iterate through the array and update the count of each number in the HashMap.
Iterate through the HashMap and find the largest number that occurs only once.

Time Complexity: O(n) Space Complexity: O(n)

Solution Code

import java.util.HashMap;

class Solution {
    public int largestUniqueNumber(int[] A) {
        HashMap<Integer, Integer> countMap = new HashMap<>();
        
        for (int num : A) {
            countMap.put(num, countMap.getOrDefault(num, 0) + 1);
        }
        
        int largestUnique = -1;
        for (int num : countMap.keySet()) {
            if (countMap.get(num) == 1 && num > largestUnique) {
                largestUnique = num;
            }
        }
        
        return largestUnique;
    }
}

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