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StepsOne steps through integer points of the straight line. The length of a step must be nonnegative and can be by one bigger than, equal to, or by on... 阅读全文
posted @ 2012-08-28 15:52
calmound
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摘要:
The ? 1 ? 2 ? ... ? n = k problemThe problemGiven the following formula, one can set operators '+' or '-' instead of each '?', in order to obtain a gi... 阅读全文
posted @ 2012-08-28 13:50
calmound
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