Description: In a graphical operating system, there are N number of windows, each one sides are parallel to the coordinate axes of a rectangular area. Points on the boundaries of the window belong to the window. Hierarchical distinction between windows, windows overlap in more than one area, the only show on the top floor window of the content. When you click on a point on the screen when you select the clicked position in the topmost window, and this window will be moved to the top level of all windows, while the remainder of the hierarchical order windows unchanged. If you click on the location does not belong to any window, the system ignores this time you click.
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windows.cpp
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