Question

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.

Example 1:

Input: [1,2,3,1] Output: true

Example 2:

Input: [1,2,3,4] Output: false

Example 3:

Input: [1,1,1,3,3,4,3,2,4,2] Output: true

Difficulty:Easy

Category:Array, Hash-Table

Analyze

Solution

class Solution {
 public:
  bool containsDuplicate(vector<int>& nums) {
    std::unordered_map<int, int> counts;
    for (int x : nums) {
      std::unordered_map<int, int>::iterator got = counts.find(x);
      if (got == counts.end())
        counts.insert({x, 0});
      else
        return true;
    }
    return false;
  }
};
By guozetang            Updated: 2020-09-19 13:02:30

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