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When the uppercase and lowercase forms of each letter contained in a string s ， appear in s ， at the same time, the string s ， is called a beautiful string. For example, "abABB" is a beautiful string, because 'a' and 'a' appear at the same time, and 'B' and 'B' appear at the same time. However, "abA" is not a good string ...

The "Divide and Conquer" in the algorithm is to divide a large problem into small problems, break them one by one, and "Divide and Conquer". The specific operation of divide and conquer algorithm is to divide the original problem into # k # smaller subproblems and solve these # k # subproblems respectively. If the subproble ...

Insert sort 1. Insert sorting directly Moving picture transfer gate. Thought: when playing poker, uncover the cards one by one and find the insertion position from back to front, so that the cards in your hand are always in an orderly state // 1. Direct insertion public static void insertSort(int[] array) { // 1. Uncover the cards on ...

Recursive divide and Conquer - Example 2. Chessboard coverage 1, Problem description In a chessboard composed of 2^k x 2k squares, exactly one square is incomplete. There are 2(2k) positions of incomplete squares. Therefore, there are 2^(2k) kinds of incomplete chessboard with K ≥ 0 In the problem of chessboard coverage, it is required t ...