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给后来人一组数据

Posted by qq490456661 at 2014-07-28 09:34:48 on Problem 1679 and last updated at 2014-07-28 09:35:42
9
1 0
4 5
1 2 1
2 3 1
3 4 1
1 4 2
2 4 1
10 15
2 10 97
2 6 18
7 1 63
5 4 62
7 5 93
1 3 10
6 9 99
3 7 73
2 7 6
5 9 22
5 3 82
4 2 36
8 1 50
10 3 20
7 9 69
10 15
10 5 79
4 2 33
4 8 41
9 3 97
5 2 25
2 6 9
2 10 66
8 3 38
10 8 89
1 10 83
1 7 91
7 3 94
7 10 40
7 2 70
2 3 82
10 15
3 8 84
7 10 34
1 10 14
1 9 60
7 6 49
8 5 39
4 5 96
4 7 78
7 3 33
2 8 56
8 9 71
5 2 83
3 6 61
7 9 63
2 6 43
10 15
1 10 25
1 3 14
10 5 72
8 3 18
2 5 41
4 9 86
6 8 17
6 2 98
5 6 34
1 8 90
7 1 65
7 2 63
8 7 71
4 2 64
9 6 50
10 15
2 7 13
5 10 52
5 2 5
10 6 47
9 4 23
8 10 54
1 10 20
4 10 8
6 1 87
8 2 43
8 1 87
6 3 53
3 1 87
2 3 82
4 6 91
10 15
1 2 14
4 1 89
7 6 8
9 4 81
5 2 81
10 9 6
1 5 44
1 3 33
2 6 25
6 10 10
1 10 65
6 9 74
8 10 41
2 3 89
5 10 2
10 15
9 8 14
2 10 66
10 5 73
2 3 98
1 3 30
6 5 3
2 1 84
2 6 33
10 8 24
5 8 34
7 1 69
3 7 60
7 4 38
4 10 65
3 4 32

答案是
0
Not Unique!
287
432
406
326
264
220
273

再来说说2种特殊情况:
第一种:
考虑n=1的时候输出0
第二种:
讨论区太水,首先,的确存在边权为0的情况,比如说:
1
6 7
1 3 1
1 2 2
2 3 3
3 4 0
4 6 5
4 5 4
5 6 6
这组数据应该输出答案12

也就是说,本题目的所有数据都是联通的,但是你在删边后需要考虑那种不联通的情况,
既然删边后不联通那就不需要和原本最小生成树的权值之和比较了。
直接continue. (这组数据删除3->4这条边权值之和也为12,但是不联通)

删边后别忘恢复边。




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