Codex 18.0

general
1

Can anyone please update the editorial of Codex 18.0 contest of 4th and 5th problem.

Thanks in advance

2

Could you elaborate more on 4th problem.

3

@abdullah768 I was approaching 5th question as largest area under histogram via segment tree. But I was unable to rectify that how to form parent node as we have to find minimum number of consecutive plates whose area is >=X.

Now comming to the 4th question I was stuck after I maintained an array 1-N which at ith index i stored how many k difference element can be chosen from there
Like for N=8 M=3 K=3
The array goes like :
5 4 3 2 1 0 0 0

Please help how to approach or is this a wrong way

4

4th can be done using stars and bars, 5th largest area under a histogram.

5

I think codechef has added a feature for answering,maybe @abdullah768 u should u use that instead of comment section :slight_smile: XD