Leave a position first. Exercise questions 7 (b) division of long intenses, it seems to write algorithms when junior high school. In addition to supplement. Exercise questions 7 (c) Sort algorithm, really ... no need to write. Exercise questions 7 (d) the problem of unbeaten ahead, the key is the rules of the wellborn chess, is it arbitrary? If so, then the answer is simple. Below is the weight of nine plaids, representing their importance, fool can see the middle position is the most important. If it is the first hand, then directly grab the middle point, then it is necessary to say it and complicated, first sleep, continue to write tomorrow.
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