i'm trying to solve this problem.. 
https://www.spoj.pl/problems/TRAFFICN/ <https://www.spoj.pl/problems/TRAFFICN/>

here there are m edges.. in addition you are given k bi directional edges 
out of which u can choose only one bi directional or u choose none of the 
additional edges...

aim is to reduce the cost to go from source to destination 

ans=min(ans,dijkstras(one new added edge)) gives me tle.... 

can anyone throw some insight into this problem

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