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Published: Apr 8, 2023 License: MIT Imports: 1 Imported by: 0

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1154. Day of the Year

题目

Given a string date representing a Gregorian calendar date formatted as YYYY-MM-DD, return the day number of the year.

Example 1:

Input: date = "2019-01-09"
Output: 9
Explanation: Given date is the 9th day of the year in 2019.

Example 2:

Input: date = "2019-02-10"
Output: 41

Example 3:

Input: date = "2003-03-01"
Output: 60

Example 4:

Input: date = "2004-03-01"
Output: 61

Constraints:

  • date.length == 10
  • date[4] == date[7] == '-', and all other date[i]'s are digits
  • date represents a calendar date between Jan 1st, 1900 and Dec 31, 2019.

题目大意

实现一个 MajorityChecker 的类,它应该具有下述几个 API:

  • MajorityChecker(int[] arr) 会用给定的数组 arr 来构造一个 MajorityChecker 的实例。
  • int query(int left, int right, int threshold) 有这么几个参数:
    • 0 <= left <= right < arr.length 表示数组 arr 的子数组的长度。
    • 2 * threshold > right - left + 1,也就是说阈值 threshold 始终比子序列长度的一半还要大。

每次查询 query(...) 会返回在 arr[left], arr[left+1], ..., arr[right] 中至少出现阈值次数 threshold 的元素,如果不存在这样的元素,就返回 -1。

提示:

  • 1 <= arr.length <= 20000
  • 1 <= arr[i] <= 20000
  • 对于每次查询,0 <= left <= right < len(arr)
  • 对于每次查询,2 * threshold > right - left + 1
  • 查询次数最多为 10000

解题思路

  • 给出一个时间字符串,求出这一天是这一年当中的第几天。
  • 简单题。依照题意处理即可。

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