Hello . Does anyone know how to register for codechef contests ?
For example for the procon 2014 ....
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Hello . Does anyone know how to register for codechef contests ?
For example for the procon 2014 ....
Hello . I have recently seen a question and I want your help ....
We have a sequence of numbers . Each of them is 1 or -1 .
In every second we can choose a contiguous subsequence of them and do
the operation for each of them : a[i] = a[i] * -1
The question is that given the sequence what is the minimum time needed to transform all of the numbers to 1 ?
Example
Input :
6
1 -1 -1 1 -1 1
Output :
2
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