LeetCode217. Contains Duplicate

文章目录

• • 一、题目
  • 二、题解

    一、题目

    index.php/tags-41973.html" >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.

    （）

    Example 1:

    Input: nums = [1,2,3,1]

    （）

    Output: true

    Example 2:

    Input: nums = [1,2,3,4]

    Output: false

    Example 3:

    Input: nums = [1,1,1,3,3,4,3,2,4,2]

    Output: true

    Constraints:

    1 public: bool containsDuplicate(vector unordered_map if(map[x] == 1) return true; map[x]++; } return false; }};