Duplicate Integer.md

Duplicate Integer 📗

Given an integer array nums, return true if any value appears more than once in the array, otherwise return false.

Example 1

Input: nums = [1, 2, 3, 3]

Output: true

Example 2

Input: nums = [1, 2, 3, 4]

Output: false

Solution.cpp

class Solution {
public:
    bool hasDuplicate(vector<int>& nums) {
        unordered_set<int> encountered;
        for (int i = 0; i < nums.size(); i++) {
            if (encountered.count(nums[i])) {
                return true; // duplicate identified
            }
            encountered.emplace(nums[i]);
        }
        return false; // no duplicates found
    }
};