This year's hottest new dining destinations, from San Francisco to Singapore.
Given N axis-aligned rectangles where N > 0, determine if they all together form an exact cover of a rectangular region. Each rectangle is represented as a bottom-left point and a top-right point. For ...
1. DFS using depth marker: 每个depth都存一下。然后如果有不符合条件的,存为-1. 一旦有 <0 或者差值大于1, 就全部返回Integer.MIN ...