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Re:既然是upper-left corner is (x1, y1) and lower-right corner is (x2, y2)，那位什么会1 <= y1 <= y2 <= n？In Reply To:既然是upper-left corner is (x1, y1) and lower-right corner is (x2, y2)，那位什么会1 <= y1 <= y2 <= n？ Posted by:IDcard at 2012-01-11 19:13:34 > RT x指行号，y指列号，可以想象成原点在左上角，x轴向下，y轴向右的坐标系。 Followed by: Post your reply here: |
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