ACQUIRE  Land Acquisition
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GOLD PROBLEMS
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Three problems numbered 1 through 3
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Problem 1: Land Acquisition [Paul Christiano, 2007]
Farmer John is considering buying more land for the farm and has
his eye on N (1 <= N <= 50,000) additional rectangular plots, each
with integer dimensions (1 <= width_i <= 1,000,000; 1 <= length_i
<= 1,000,000).
If FJ wants to buy a single piece of land, the cost is $1/square
unit, but savings are available for large purchases. He can buy
any number of plots of land for a price in dollars that is the width
of the widest plot times the length of the longest plot. Of course,
land plots cannot be rotated, i.e., if Farmer John buys a 3x5 plot
and a 5x3 plot in a group, he will pay 5x5=25.
FJ wants to grow his farm as much as possible and desires all the
plots of land. Being both clever and frugal, it dawns on him that
he can purchase the land in successive groups, cleverly minimizing
the total cost by grouping various plots that have advantageous
width or length values.
Given the number of plots for sale and the dimensions of each,
determine the minimum amount for which Farmer John can purchase all
PROBLEM NAME: acquire
INPUT FORMAT:
* Line 1: A single integer: N
* Lines 2..N+1: Line i+1 describes plot i with two spaceseparated
integers: width_i and length_i
SAMPLE INPUT:
4
100 1
15 15
20 5
1 100
INPUT DETAILS:
There are four plots for sale with dimensions as shown.
OUTPUT FORMAT:
* Line 1: The minimum amount necessary to buy all the plots.
SAMPLE OUTPUT:
500
OUTPUT DETAILS:
The first group contains a 100x1 plot and costs 100. The next group
contains a 1x100 plot and costs 100. The last group contains both the 20x5
plot and the 15x15 plot and costs 300. The total cost is 500, which is
minimal.
hide comments
kaneki0530:
20180603 13:14:31
WA!!! I followed the method given on Wiki, convexhulltrick dp solution 

totallynotan:
20180411 19:40:03
OK friends if you are getting WA these are the test cases: http://contest.usaco.org/MAR08.htm. Hope that helps 

basilisk1995:
20180307 14:55:47
I submitted the solution given in the wcipeg article and got WA. 

enzymii:
20180203 01:45:00
Good convex hull trick! 

narutoumania:
20170730 21:29:22
Finally accepted!!o(n2) solution.useful link https://wcipeg.com/wiki/Convex_hull_trick for solving


srinu_73:
20170621 10:44:47
Removed irrelevant rectangles and O(n^2) DP passed. 

orion_pax:
20170608 06:50:38
I tried both dp and convex hull technique, only latter gives AC (dp solution passes all test cases of spoj toolkit), dp solution gives WA. 

jedigeki:
20160915 13:12:24
I haven't read convex hull trick and am trying to pass a O(n^2) solution, but am getting WA.


sieunhanbom04:
20160802 11:18:31
will O(n^2) DP be good enough?


xinnix:
20160609 17:13:23
Taking long long int and still saying compilation error..

Added by:  Hasan Jaddouh 
Date:  20130531 
Time limit:  1s 
Source limit:  50000B 
Memory limit:  1536MB 
Cluster:  Cube (Intel G860) 
Languages:  All except: ASM64 
Resource:  USACO Mar08 