Python 刷Leetcode题库，顺带学英语单词（48）

Contains Duplicate

Given an array of integers, find if the array contains any duplicates.    [#217]

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.

   Examples:

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

Contains Duplicate II

Given an array of integers and an integer k, find out whether there are two distinct indices i and j in the array such that nums[i] = nums[j] and the absolute difference between i and j is at most k.    [#219]

   Examples:

Input: nums = [1,2,3,1], k = 3
    Output: true
    Input: nums = [1,0,1,1], k = 1
    Output: true
    Input: nums = [1,2,3,1,2,3], k = 2
    Output: false

Contains Duplicate III

Given an array of integers, find out whether there are two distinct indices i and j in the array such that the absolute difference between nums[i] and nums[j] is at most t and the absolute difference between i and j is at most k.    [#220]

   Examples:

Input: nums = [1,2,3,1], k = 3, t = 0
    Output: true
    Input: nums = [1,0,1,1], k = 1, t = 2
    Output: true
    Input: nums = [1,5,9,1,5,9], k = 2, t = 3
    Output: false