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Codeforces 59A

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                                                                                       A. Word time limit per test 2 seconds memory limit per test 256 megabytes Vasya is very upset that many people on the Net mix uppercase and lowercase letters in one word. That's why he decided to invent an extension for his favorite browser that would change the letters' register in every word so that it either only consisted of lowercase letters or, vice versa, only of uppercase ones. At that as little as possible letters should be changed in the word. For example, the word HoUse must be replaced with house , and the word ViP — with VIP . If a word contains an equal number of uppercase and lowercase letters, you should replace all the letters with lowercase ones. For example, maTRI...
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A. Turtle Puzzle: Rearrange and Negate

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  A. Turtle Puzzle: Rearrange and Negate time limit per test 2 seconds memory limit per test 256 megabytes You are given an array  a �  of  n �  integers. You must perform the following two operations on the array (the first, then the second): Arbitrarily rearrange the elements of the array or leave the order of its elements unchanged. Choose at most one contiguous segment of elements and replace the signs of all elements in this segment with their opposites. Formally, you can choose a pair of indices  l , r � , �  such that  1 ≤ l ≤ r ≤ n 1 ≤ � ≤ � ≤ �  and assign  a i = − a i � � = − � �  for all  l ≤ i ≤ r � ≤ � ≤ �  (negate elements). Note that you may choose not to select a pair of indices and leave all the signs of the elements unchanged. What is the  maximum sum of the array elements  after performing these two operations (the first, then the second)? Input The first line of the input contains a single int...
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