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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?

Posted by firstdeep at 2016-08-22 21:00:27 on Problem 2155
In Reply To: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? Posted by:firstdeep at 2016-08-22 20:59:39
因为x1,x2指的是行号,y1,y2指的是列号~

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