001Contains Duplicate

def containsDuplicate(nums: list[int]) -> bool:
    return len(nums) != len(set(nums))

public boolean containsDuplicate(int[] nums) {
    Set<Integer> seen = new HashSet<>();
    for (int n : nums)
        if (!seen.add(n)) return true;
    return false;
}

fun containsDuplicate(nums: IntArray): Boolean =
    nums.size != nums.toHashSet().size

bool containsDuplicate(vector<int>& nums) {
    unordered_set<int> seen;
    for (int n : nums)
        if (!seen.insert(n).second) return true;
    return false;
}

bool containsDuplicate(int* nums, int numsSize) {
    for (int i = 0; i < numsSize; i++)
        for (int j = i + 1; j < numsSize; j++)
            if (nums[i] == nums[j]) return true;
    return false;
}