- Time limit: 1.00 s
- Memory limit: 512 MB
You are going to travel from Syrjälä to Lehmälä by plane. You would like to find answers to the following questions:
- what is the minimum price of such a route?
- how many minimum-price routes are there? (modulo 10^9+7)
- what is the minimum number of flights in a minimum-price route?
- what is the maximum number of flights in a minimum-price route?
The first input line contains two integers n and m: the number of cities and the number of flights. The cities are numbered 1,2,\ldots,n. City 1 is Syrjälä, and city n is Lehmälä.
After this, there are m lines describing the flights. Each line has three integers a, b, and c: there is a flight from city a to city b with price c. All flights are one-way flights.
You may assume that there is a route from Syrjälä to Lehmälä.
Print four integers according to the problem statement.
- 1 \le n \le 10^5
- 1 \le m \le 2 \cdot 10^5
- 1 \le a,b \le n
- 1 \le c \le 10^9
4 5 1 4 5 1 2 4 2 4 5 1 3 2 3 4 3
5 2 1 2