TRVCOST - Travelling cost
The government of Spoj_land has selected number of locations in the city for road construction and numbered those locations as 0,1,2,3,.......500.
Now, they want to construct roads between various pairs of location(say A and B ) and have fixed the cost for travelling between those pair of locations from either end as W unit.
Now , Rohit being a curious boy wants to find the minimum cost for travelling from location U (source) to Q number of other locations (destination).
First line contains N ,the number of roads that government constructed.
Next N line contains three integers A ,B, and W.
A and B represent the locations between which the road was constructed and W is the fixed cost for travelling from A to B or from B to A.
Next line contains an integer U from where Rohit wants to travel to other locations.
Next line contain Q , the number of queries (finding cost) that he wants to perform.
Next Q lines contain an integer V (destination) for which minimum cost is to be found from U.
Print the required answer in each line.
If he can't travel from location U to V by any means then, print 'NO PATH' without quotes.
Input: 7 0 1 4 0 3 8 1 4 1 1 2 2 4 2 3 2 5 3 3 4 2 0 4 1 4 5 7 Output: 4 5 9 NO PATH
0->1: cost =4
0->4= 0->1->4 cost=4+1=5
0->5= 0->1->2->5 cost=4+2+3=9
0->7= no path exist between 0 and 7
Simple Dijkstra. AC in one go :) .Just a few hints
i got WA assuming 501 vertices, changed it to 502 and AC.
What if the input contain same edges, should I ignore them or update cost?
For those who getting NZEC at TC10: Check all constrains and have your arrays size follow the constrains not N
AC with dijkstra in one go :)
Thanks @sherlock11. Your warning was of great help.
input contains same edges more than once..........so take care of that
It appears that the test cases are weak. My Floyd Warshall algo was giving the wrong answer but still it ran correctly. Also a huge running time gap between floyd warshall and dijkstra!
Constraints are stated correctly, got AC assuming U,V <= 500. Read older comments for WA-related hints. Good problem.
Those getting error in test case 10,check for :