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Thanks I understood.
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I think test 27 is wrong here. The test case is the following- 10 5 8 1000001110 The jury's answer is 1. It should be two. According to me there are three possible cheapest ways to get to the destination. first is 5 to 6 then 6 to 8 price (8-6 =2) second is 5 to 7 then 7 to 8 price (7-5 =2) third is 5 to 10 then 10 to 8 price (10-8=2) my submission