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1532:Drainage Ditches

题目描述
Every time it rains on Farmer John's fields, a pond forms over Bessie's favorite clover patch. This means that the clover is covered by water for awhile and takes quite a long time to regrow. Thus, Farmer John has built a set of drainage ditches so that Bessie's clover patch is never covered in water. Instead, the water is drained to a nearby stream. Being an ace engineer, Farmer John has also installed regulators at the beginning of each ditch, so he can control at what rate water flows into that ditch.
Farmer John knows not only how many gallons of water each ditch can transport per minute but also the exact layout of the ditches, which feed out of the pond and into each other and stream in a potentially complex network.
Given all this information, determine the maximum rate at which water can be transported out of the pond and into the stream. For any given ditch, water flows in only one direction, but there might be a way that water can flow in a circle.
输入解释
The input includes several cases. For each case, the first line contains two space-separated integers, N (0 <= N <= 200) and M (2 <= M <= 200). N is the number of ditches that Farmer John has dug. M is the number of intersections points for those ditches. Intersection 1 is the pond. Intersection point M is the stream. Each of the following N lines contains three integers, Si, Ei, and Ci. Si and Ei (1 <= Si, Ei <= M) designate the intersections between which this ditch flows. Water will flow through this ditch from Si to Ei. Ci (0 <= Ci <= 10,000,000) is the maximum rate at which water will flow through the ditch.
输出解释
For each case, output a single integer, the maximum rate at which water may emptied from the pond.
输入样例
5 4
1 2 40
1 4 20
2 4 20
2 3 30
3 4 10
输出样例
50
来自杭电HDUOJ的附加信息
Recommend lwg

该题目是Virtual Judge题目,来自 杭电HDUOJ

题目来源 USACO 93

源链接: HDU-1532

最后修改于 2020-10-25T22:45:47+00:00 由爬虫自动更新

共提交 87

通过率 88.51%
时间上限 内存上限
2000/1000MS(Java/Others) 65536/32768K(Java/Others)