What is the proof of Editorial Solution of this problem? http://community.topcoder.com/stat?c=problem_statement&pm=13090&rd=15848
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What is the proof of Editorial Solution of this problem? http://community.topcoder.com/stat?c=problem_statement&pm=13090&rd=15848
Can anyone explain the solution to this question ? http://acm.hdu.edu.cn/showproblem.php?pid=4253
Could someone guide me for preparing for ICPC regionals. I find myself lost on how to progress. Just need some guidance :) .
I was trying to solve This Problem on Spoj.
The problem is to find the sum of all divisors of i where i=1 to i=N.
We have to solve this in sqrt(n) complexity.
This is the Ac'ed python Code, I couldn't figure out the logic behind this.
Please provide me with some hints..Thanks
Problem Link
My approach:
I applied Binary search on Mean(i.e answer to be found) and assigned weight of each edge equal to [Val-Mid] (Val is the value of each egde in the initial graph and Mid is the present Value of Mean during the binary search).
For each Mid in binary search I applied Bellman ford to check if any negative value cycle exists. I am constantly getting WA.(i even tried floyd for negative cycle detection).
Any help is appreciated.
How to solve this problem on Convex hull? http://poj.org/problem?id=1294
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