217. 存在重复元素
class Solution {
public boolean containsDuplicate(int[] nums) {
Set<Integer> set = new HashSet<>();
for (int i = 0; i < nums.length; i++) {
if (set.contains(nums[i]))
return true;
else
set.add(nums[i]);
}
return false;
}
}
class Solution {
public boolean containsDuplicate(int[] nums) {
Set<Integer> set = new HashSet<>();
for (int i = 0; i < nums.length; i++) {
if (set.contains(nums[i]))
return true;
else
set.add(nums[i]);
}
return false;
}
}
让时间为你证明