{ "data": { "question": { "questionId": "2205", "questionFrontendId": "2100", "categoryTitle": "Algorithms", "boundTopicId": 1149825, "title": "Find Good Days to Rob the Bank", "titleSlug": "find-good-days-to-rob-the-bank", "content": "
You and a gang of thieves are planning on robbing a bank. You are given a 0-indexed integer array security
, where security[i]
is the number of guards on duty on the ith
day. The days are numbered starting from 0
. You are also given an integer time
.
The ith
day is a good day to rob the bank if:
time
days before and after the ith
day,time
days before i
are non-increasing, andtime
days after i
are non-decreasing.More formally, this means day i
is a good day to rob the bank if and only if security[i - time] >= security[i - time + 1] >= ... >= security[i] <= ... <= security[i + time - 1] <= security[i + time]
.
Return a list of all days (0-indexed) that are good days to rob the bank. The order that the days are returned in does not matter.
\n\n\n
Example 1:
\n\n\nInput: security = [5,3,3,3,5,6,2], time = 2\nOutput: [2,3]\nExplanation:\nOn day 2, we have security[0] >= security[1] >= security[2] <= security[3] <= security[4].\nOn day 3, we have security[1] >= security[2] >= security[3] <= security[4] <= security[5].\nNo other days satisfy this condition, so days 2 and 3 are the only good days to rob the bank.\n\n\n
Example 2:
\n\n\nInput: security = [1,1,1,1,1], time = 0\nOutput: [0,1,2,3,4]\nExplanation:\nSince time equals 0, every day is a good day to rob the bank, so return every day.\n\n\n
Example 3:
\n\n\nInput: security = [1,2,3,4,5,6], time = 2\nOutput: []\nExplanation:\nNo day has 2 days before it that have a non-increasing number of guards.\nThus, no day is a good day to rob the bank, so return an empty list.\n\n\n
\n
Constraints:
\n\n1 <= security.length <= 105
0 <= security[i], time <= 105
你和一群强盗准备打劫银行。给你一个下标从 0 开始的整数数组 security
,其中 security[i]
是第 i
天执勤警卫的数量。日子从 0
开始编号。同时给你一个整数 time
。
如果第 i
天满足以下所有条件,我们称它为一个适合打劫银行的日子:
i
天前和后都分别至少有 time
天。i
天前连续 time
天警卫数目都是非递增的。i
天后连续 time
天警卫数目都是非递减的。更正式的,第 i
天是一个合适打劫银行的日子当且仅当:security[i - time] >= security[i - time + 1] >= ... >= security[i] <= ... <= security[i + time - 1] <= security[i + time]
.
请你返回一个数组,包含 所有 适合打劫银行的日子(下标从 0 开始)。返回的日子可以 任意 顺序排列。
\n\n\n\n
示例 1:
\n\n\n输入:security = [5,3,3,3,5,6,2], time = 2\n输出:[2,3]\n解释:\n第 2 天,我们有 security[0] >= security[1] >= security[2] <= security[3] <= security[4] 。\n第 3 天,我们有 security[1] >= security[2] >= security[3] <= security[4] <= security[5] 。\n没有其他日子符合这个条件,所以日子 2 和 3 是适合打劫银行的日子。\n\n\n
示例 2:
\n\n\n输入:security = [1,1,1,1,1], time = 0\n输出:[0,1,2,3,4]\n解释:\n因为 time 等于 0 ,所以每一天都是适合打劫银行的日子,所以返回每一天。\n\n\n
示例 3:
\n\n\n输入:security = [1,2,3,4,5,6], time = 2\n输出:[]\n解释:\n没有任何一天的前 2 天警卫数目是非递增的。\n所以没有适合打劫银行的日子,返回空数组。\n\n\n
\n\n
提示:
\n\n1 <= security.length <= 105
0 <= security[i], time <= 105
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