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Language: Barn Expansion
Description Farmer John has N (1 <= N <= 25,000) rectangular barns on his farm, all with sides parallel to the X and Y axes and integer corner coordinates in the range 0..1,000,000. These barns do not overlap although they may share corners and/or sides with other barns.
Since he has extra cows to milk this year, FJ would like to expand some of his barns. A barn has room to expand if it does not share a corner or a wall with any other barn. That is, FJ can expand a barn if all four of its walls can be pushed outward by at least some amount without bumping into another barn. If two barns meet at a corner, neither barn can expand. Please determine how many barns have room to expand. Input Line 1: A single integer, N
Lines 2..N+1: Four space-separated integers A, B, C, and D, describing one barn. The lower-left corner of the barn is at (A,B) and the upper right corner is at (C,D). Output Line 1: A single integer that is the number of barns that can be expanded. Sample Input 5 0 2 2 7 3 5 5 8 4 2 6 4 6 1 8 6 0 0 8 1 Sample Output 2 Hint Explanation of the sample:
There are 5 barns. The first barn has its lower-left corner at (0,2) and its upper-right corner at (2,7), and so on. Only two barns can be expanded --- the first two listed in the input. All other barns are each in contact with at least one other barn. Source |

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