Example: Contains Duplicate - rFronteddu/general_wiki GitHub Wiki
Given an integer array nums, return true if any value appears at least twice in the array, and return false if every element is distinct.
class Solution {
public boolean containsDuplicate (int[] nums) {
Set<Integer> set = new HashSet<>();
for (int num : nums) {
if (set.contains (num)) {
return true;
}
set.add (num);
}
return false;
}
}