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这句话矛盾

Posted by gemenhao at 2006-04-04 10:21:20 on Problem 2155
1. C x1 y1 x2 y2 (1 <= x1 <= x2 <= n, 1 <= y1 <= y2 <= n) changes the matrix by using the rectangle whose upper-left corner is (x1, y1) and lower-right corner is (x2, y2). 
左上 因该满足 x1 < x2 ,y1 > y2

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