I was solving this question: http://codeforces.com/contest/479/problem/B↵
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The output specification states that:↵
"Note that in the process of performing operations the heights of some towers can become equal to zero."↵
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Consider the second test case:↵
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3 4 ↵
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2 2 4↵
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We can arrive at a better solution than the one given by doing the following operations:↵
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1 2↵
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1 2↵
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Now the towers are: 4 4 with instability 0 (as tower 1 no longer exists). But the answer states minimum as 1.↵
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Can somebody please help me understand what I am misunderstanding here?↵
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**EDIT:** So I understood that I should not have assumed that a tower with no blocks will not exist. I am now interested in this variant:↵
↵
Suppose a tower with no blocks ceases to exist. How would one solve this problem now? I tried but could not come on with a working solution. Example: There are 3 towers initially: 2 5 7. Suppose we can only move two blocks. Then we can achieve zero instability. Any help is appreciated.
↵
The output specification states that:↵
"Note that in the process of performing operations the heights of some towers can become equal to zero."↵
↵
Consider the second test case:↵
↵
3 4 ↵
↵
2 2 4↵
↵
We can arrive at a better solution than the one given by doing the following operations:↵
↵
1 2↵
↵
1 2↵
↵
Now the towers are: 4 4 with instability 0 (as tower 1 no longer exists). But the answer states minimum as 1.↵
↵
Can somebody please help me understand what I am misunderstanding here?↵
↵
**EDIT:** So I understood that I should not have assumed that a tower with no blocks will not exist. I am now interested in this variant:↵
↵
Suppose a tower with no blocks ceases to exist. How would one solve this problem now? I tried but could not come on with a working solution. Example: There are 3 towers initially: 2 5 7. Suppose we can only move two blocks. Then we can achieve zero instability. Any help is appreciated.
