EZDIJKST  Easy Dijkstra Problem
Determine the shortest path between the specified vertices in the graph given in the input data.
Hint: You can use Dijkstra's algorithm.
Hint 2: if you're a lazy C++ programmer, you can use set and cin/cout (with sync_with_stdio(0))  it should suffice.
Input
first line  one integer  number of test cases
For each test case the numbers V, K (number of vertices, number of edges) are given,
Then K lines follow, each containing the following numbers separated by a single space:
a_{i}, b_{i}, c_{i}
It means that the graph being described contains an edge from a_{i} to b_{i},
with a weight of c_{i}.
Below the graph description a line containing a pair of integers A, B is present.
The goal is to find the shortest path from vertex A to vertex B.
All numbers in the input data are integers in the range 0..10000.
Output
For each test case your program should output (in a separate line) a single number C  the length of the shortest path from vertex A to vertex B. In case there is no such path, your program should output a single word "NO" (without quotes)
Example
Input: 3 3 2 1 2 5 2 3 7 1 3 3 3 1 2 4 1 3 7 2 3 1 1 3 3 1 1 2 4 1 3 Output: 12 5 NO
hide comments
kasra2005:
20201026 09:15:36
whats wrong with this?


schnaggrwl:
20200810 08:50:03
directed graph! 

yashkwatra92:
20200731 16:58:58
done in second attempt so much easy though 

cynder:
20200709 21:56:05
AC in 7th go :)


hchauhan7816:
20200427 17:04:58
For information, the graph has directed edges. Be careful !!


rahatkhan99:
20200404 13:38:25
WTF is going here??? You should give a hint if it's a directed or undirected graph. 

mahatejvarma:
20200322 15:41:42
First time commenting this...AC in one go!!! 

deependra_18:
20200315 15:07:41
graph is directed so be careful it cost me 1 WA. 

hamobos_499:
20191212 15:33:42
The graph is directed btw 

gabirosa:
20191203 02:54:36
tenso migos 
Added by:  Robert Rychcicki 
Date:  20090110 
Time limit:  1s 
Source limit:  50000B 
Memory limit:  1536MB 
Cluster:  Cube (Intel G860) 
Languages:  All except: ERL JSRHINO NODEJS OBJC PERL6 VB.NET 