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CSES Problem Set

Flight Routes

Task | Statistics

CSES - Flight Routes

Time limit:1.00 s Memory limit:512 MB

Your task is to find $k$ shortest flight routes from Syrjälä to Metsälä. A route can visit the same city several times.


The first input line has three integers $n$, $m$, and $k$: the number of cities, the number of flights, and the parameter $k$. The cities are numbered $1,2,\ldots,n$. City 1 is Syrjälä, and city $n$ is Metsälä.

After this, the input has $m$ lines that describe the flights. Each line has three integers $a$, $b$, and $c$: a flight begins at city $a$, ends at city $b$, and its price is $c$. All flights are unidirectional.


Print $k$ integers: the prices of the $k$ cheapest routes sorted according to their prices. You can assume that there are at least $k$ different routes.


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

5 7 8