{ "data": { "question": { "questionId": "3794", "questionFrontendId": "3494", "categoryTitle": "Algorithms", "boundTopicId": 3621250, "title": "Find the Minimum Amount of Time to Brew Potions", "titleSlug": "find-the-minimum-amount-of-time-to-brew-potions", "content": "
You are given two integer arrays, skill
and mana
, of length n
and m
, respectively.
In a laboratory, n
wizards must brew m
potions in order. Each potion has a mana capacity mana[j]
and must pass through all the wizards sequentially to be brewed properly. The time taken by the ith
wizard on the jth
potion is timeij = skill[i] * mana[j]
.
Since the brewing process is delicate, a potion must be passed to the next wizard immediately after the current wizard completes their work. This means the timing must be synchronized so that each wizard begins working on a potion exactly when it arrives.
\n\nReturn the minimum amount of time required for the potions to be brewed properly.
\n\n\n
Example 1:
\n\nInput: skill = [1,5,2,4], mana = [5,1,4,2]
\n\nOutput: 110
\n\nExplanation:
\n\nPotion Number | \n\t\t\tStart time | \n\t\t\tWizard 0 done by | \n\t\t\tWizard 1 done by | \n\t\t\tWizard 2 done by | \n\t\t\tWizard 3 done by | \n\t\t
---|---|---|---|---|---|
0 | \n\t\t\t0 | \n\t\t\t5 | \n\t\t\t30 | \n\t\t\t40 | \n\t\t\t60 | \n\t\t
1 | \n\t\t\t52 | \n\t\t\t53 | \n\t\t\t58 | \n\t\t\t60 | \n\t\t\t64 | \n\t\t
2 | \n\t\t\t54 | \n\t\t\t58 | \n\t\t\t78 | \n\t\t\t86 | \n\t\t\t102 | \n\t\t
3 | \n\t\t\t86 | \n\t\t\t88 | \n\t\t\t98 | \n\t\t\t102 | \n\t\t\t110 | \n\t\t
As an example for why wizard 0 cannot start working on the 1st potion before time t = 52
, consider the case where the wizards started preparing the 1st potion at time t = 50
. At time t = 58
, wizard 2 is done with the 1st potion, but wizard 3 will still be working on the 0th potion till time t = 60
.
Example 2:
\n\nInput: skill = [1,1,1], mana = [1,1,1]
\n\nOutput: 5
\n\nExplanation:
\n\nt = 0
, and is completed by time t = 3
.t = 1
, and is completed by time t = 4
.t = 2
, and is completed by time t = 5
.Example 3:
\n\nInput: skill = [1,2,3,4], mana = [1,2]
\n\nOutput: 21
\n\n
Constraints:
\n\nn == skill.length
m == mana.length
1 <= n, m <= 5000
1 <= mana[i], skill[i] <= 5000
给你两个长度分别为 n
和 m
的整数数组 skill
和 mana
。
在一个实验室里,有 n
个巫师,他们必须按顺序酿造 m
个药水。每个药水的法力值为 mana[j]
,并且每个药水 必须 依次通过 所有 巫师处理,才能完成酿造。第 i
个巫师在第 j
个药水上处理需要的时间为 timeij = skill[i] * mana[j]
。
由于酿造过程非常精细,药水在当前巫师完成工作后 必须 立即传递给下一个巫师并开始处理。这意味着时间必须保持 同步,确保每个巫师在药水到达时 马上 开始工作。
\n\n返回酿造所有药水所需的 最短 总时间。
\n\n\n\n
示例 1:
\n\n输入: skill = [1,5,2,4], mana = [5,1,4,2]
\n\n输出: 110
\n\n解释:
\n\n药水编号 | \n\t\t\t开始时间 | \n\t\t\t巫师 0 完成时间 | \n\t\t\t巫师 1 完成时间 | \n\t\t\t巫师 2 完成时间 | \n\t\t\t巫师 3 完成时间 | \n\t\t
---|---|---|---|---|---|
0 | \n\t\t\t0 | \n\t\t\t5 | \n\t\t\t30 | \n\t\t\t40 | \n\t\t\t60 | \n\t\t
1 | \n\t\t\t52 | \n\t\t\t53 | \n\t\t\t58 | \n\t\t\t60 | \n\t\t\t64 | \n\t\t
2 | \n\t\t\t54 | \n\t\t\t58 | \n\t\t\t78 | \n\t\t\t86 | \n\t\t\t102 | \n\t\t
3 | \n\t\t\t86 | \n\t\t\t88 | \n\t\t\t98 | \n\t\t\t102 | \n\t\t\t110 | \n\t\t
举个例子,为什么巫师 0 不能在时间 t = 52
前开始处理第 1 个药水,假设巫师们在时间 t = 50
开始准备第 1 个药水。时间 t = 58
时,巫师 2 已经完成了第 1 个药水的处理,但巫师 3 直到时间 t = 60
仍在处理第 0 个药水,无法马上开始处理第 1个药水。
示例 2:
\n\n输入: skill = [1,1,1], mana = [1,1,1]
\n\n输出: 5
\n\n解释:
\n\nt = 0
开始,并在时间 t = 3
完成。t = 1
开始,并在时间 t = 4
完成。t = 2
开始,并在时间 t = 5
完成。示例 3:
\n\n输入: skill = [1,2,3,4], mana = [1,2]
\n\n输出: 21
\n\n\n
提示:
\n\nn == skill.length
m == mana.length
1 <= n, m <= 5000
1 <= mana[i], skill[i] <= 5000
f[i]
.",
"Let x
be the current mana value. Starting from now = f[0]
, update now = max(now + skill[i - 1] * x, f[i])
for i in [1..n]
. Then, the final f[n - 1] = now + skill[n - 1] * x
for this potion.",
"Update all other f
values by f[i] = f[i + 1] - skill[i + 1] * x
for i in [0..n - 2]
(in reverse order)."
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