fullbuster's blog

By fullbuster, history, 7 years ago, In English

Recently the codeforces is taking like hours to pass on the verdict of submission. It's been more than half an hour and my submission is still in queue .

Can someone tell me why this is happening and for how long this problem is going to persist.

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By fullbuster, history, 7 years ago, In English

I am trying to learn hashing and for this i am solving a problem in which there are n array's of 0 and 1 and given two arrays we have two tell whether they are equal or not.

I have heard that this problem can be solved using hashing but i am unable to come up with a hash function which can give a unique hash value for a given permutation of 0 and 1 in form of array.

Can someone suggest me such a hash function and also how to prove that it is valid.

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By fullbuster, history, 7 years ago, In English

Problem link http://codeforces.com/problemset/problem/359/D

Here is my solution for the problem http://codeforces.com/contest/359/submission/27581236 I first created lefty[i] and righty[i] which contains the left and right index of the farthest number such that all numbers between farthest number and number at index i are divisible by a[i] . I created it using sparse table . My solution is failing at testcase 25 can someone please help me to debug it.

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