Nộp bài | Các bài nộp | Làm tốt nhất | Về danh sách bài |
TRAFFICN - Traffic Network |
The city traffic network consists of n nodes numbered from 1 to n and m one-way roads connecting pairs of nodes. In order to reduce the length of the shortest path between two different critical nodes s and t, a list of k two-way roads are proposed as candidates to be constructed. Your task is to write a program to choose one two-way road from the proposed list in order to minimize the resulting shortest path between s and t.
Input
The input file consists of several data sets. The first line of the input file contains the number of data sets which is a positive integer and is not bigger than 20. The following lines describe the data sets.
For each data set, the first line contains five positive integers n (n ≤ 10 000), m (m ≤ 100 000), k (k < 300), s (1 ≤ s ≤ n), t (1 ≤ t ≤ n) separated by space. The ith line of the following m lines contains three integers di, ci, li separated by space, representing the length li ( 0< li ≤ 1000) of the ith one-way road connecting node di to ci. The jth line of the next k lines contains three positive integers uj, vj and qj (qj ≤ 1000) separated by space, representing the jth proposed two-way road of length qj connecting node uj to vj.
Output
For each data set, write on one line the smallest possible length of the shortest path after building the chosen one two-way road from the proposed list. In case, there does not exist a path from s to t, write -1.
Example
Sample Input 1 4 5 3 1 4 1 2 13 2 3 19 3 1 25 3 4 17 4 1 18 1 3 23 2 3 5 2 4 25 Sample Output 35
Được gửi lên bởi: | Jimmy |
Ngày: | 2009-01-04 |
Thời gian chạy: | 1s |
Giới hạn mã nguồn: | 50000B |
Memory limit: | 1536MB |
Cluster: | Cube (Intel G860) |
Ngôn ngữ cho phép: | Tất cả ngoại trừ: ERL GOSU JS-RHINO NODEJS PERL6 PYPY RUST SED VB.NET |
Nguồn bài: | ACM Regional, HCMC 2008 Tic Tac Toe |
hide comments
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2019-07-09 15:13:58
[sao toan nhung bai ntn vay mn] |
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2019-06-06 07:36:27
mẹ toàn sigabrt đ hiểu |
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2019-05-22 15:49:49
_CBG_K28_ học sinh thầy thuấn, thầy hương tự tin tự tay 1 đấm AC :)) |
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2018-12-04 06:07:12
HAIZZZ MESO AC DC |
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2018-08-22 11:39:05
nhat hao sach |
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2018-06-05 10:23:16
bóp time vl :( |
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2018-06-05 06:25:04
trâu đ ac nhé |
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2017-11-02 08:15:07
love you :))))))))))) |
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2017-09-05 19:21:02
xem thuật toán và code ở https://vietcodes.github.io/code/70/ |
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2017-06-29 04:08:30
Trâu cũng AC |