LeetCode:Contains Duplicate

Contains Duplicate

Total Accepted: 92048 Total
Submissions: 221101 Difficulty: Easy

Given an array of integers, find if the array contains any duplicates. Your function should return true if any value appears
at least twice in the array, and it should return false if every element is distinct.

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(E) Contains Duplicate II (M)
Contains Duplicate III

java code:

public class Solution {
public boolean containsDuplicate(int[] nums) {
Set<Integer> set = new HashSet<Integer>();

for(int num:nums) {
if(!set.add(num)) return true;
}

return false;
}
}

c++ code:

class Solution {
public:
bool containsDuplicate(vector<int>& nums) {
return set<int>(nums.begin(),nums.end()).size() < nums.size();
}
};