0217.Contains-Duplicate

題目

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 <= nums.length <= 105
• -109 <= nums[i] <= 109

題目大意

解題思路

來源

• https://leetcode.com/problems/contains-duplicate/description/

解答

https://github.com/kimi0230/LeetcodeGolang/blob/master/Leetcode/0217.Contains-Duplicate/main.go

package containsduplicate

func ContainsDuplicate(nums []int) bool {
    numsMap := make(map[int]bool, len(nums))
    for _, v := range nums {
        if numsMap[v] {
            return true
        }
        numsMap[v] = true
    }
    return false
}

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