11791179 SUSTech Online Judge
Problem 1179 --DSAA Path

1179: DSAA Path

Time Limit: 1 Sec  Memory Limit: 128 MB
Submit: 1059  Solved: 146
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Description

Input

Output

Sample Input

1
4 5 1
1 2 1
1 3 2
1 4 3
3 4 2
2 3 2
2

Sample Output

5

HINT

Source

Graph 

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