Added a Dijkstra test.
Added a Dijkstra test.

SuprDewd/CompetitiveProgramming,nikhiljangam/CompetitiveProgramming,goswamia/CompetitiveProgramming,goswamia/CompetitiveProgramming,goswamia/CompetitiveProgramming,SuprDewd/CompetitiveProgramming,nikhiljangam/CompetitiveProgramming,nikhiljangam/CompetitiveProgramming,goswamia/CompetitiveProgramming,nikhiljangam/CompetitiveProgramming,SuprDewd/CompetitiveProgramming,SuprDewd/CompetitiveProgramming