Contains Duplicate
題意:
解題思路:
使用set來作就好了。
public class Solution {
public boolean containsDuplicate(int[] nums) {
if (nums == null || nums.length <= 1) {
return false;
}
Set<Integer> set = new HashSet<Integer>();
for (int i = 0; i < nums.length; i++) {
if (set.contains(nums[i])) {
return true;
}
set.add(nums[i]);
}
return false;
}
}