Contains Duplicate

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.

 

Method:

using a unordered_set to find duplicated case.

复制代码
 1 class Solution {
 2 public:
 3     bool containsDuplicate(vector<int>& nums) {
 4         if (nums.empty()) {
 5             return false;
 6         }
 7         unordered_set<int> set;
 8         for (auto x : nums) {
 9             if (set.find(x) != set.end()) {
10                 return true;
11             }
12             set.insert(x);
13         }
14         return false;
15     }
16 };
复制代码

 

 



posted @   huj690  阅读(135)  评论(0编辑  收藏  举报
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