Chefland and Electricity

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There are n villages in a Chefland. Some of the villages have electricity facilities, other doesn't. You can consider the villages arranged in line in the order 1 to n from left to right. i-th of village can be considered at xi coordinates. Chef decided that electricity should be provided to all the villages. So, he decides to buy some amount of electric wires to connect the villeges without elec

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