darkworld1's blog

By darkworld1, history, 4 months ago, In English,

hi everyone i am trying to solve a question . the question goes like this

you have given an array you have to maximize the cost factor of array and cost can be calculated in following way

COST = A*a[i]-B*a[j]+C*a[k]+D*a[l]+E*a[m] where i<j<k<l<m

now you have given A,B,C,D,E , maximize the cost of given array

sample test case n= 5

array = { 10 17 15 6 17}

A=8, B=5, C=4, D=6, E=9

Output is 172

..............................................................................

MY approach is simple i make a dp[n][4] and dp[i][0] calculate the max of A*a[i] till i , dp[j][1] calculate the max of A*a[i]-B*a[j] and so on ..

 
 
 
 
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4 months ago, # |
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Auto comment: topic has been updated by darkworld1 (previous revision, new revision, compare).

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4 months ago, # |
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Auto comment: topic has been updated by darkworld1 (previous revision, new revision, compare).

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4 months ago, # |
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This is quite a short yet impolite way to ask a question since you just mention the problem and assume that the community will help you.

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    4 months ago, # ^ |
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    i agree it is short but it explaining the hole question and why you think it is impolite way of asking question ?

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      4 months ago, # ^ |
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      You just state the problem with the title "help". You didn't say "please help" or anything like that. It will most likely lower the mood of people reading this post.

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4 months ago, # |
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I think DP works here

dp[pos][state] to determine what will be the result

for example dp[3][3] = max(dp[3][3],C*arr[3]+dp[2][2])

or dp[4][3] = max(dp[4][3],C*arr[4]+dp[3][2])

calculating from previous state.

and answer will be maximum of dp[i][5]