I couldn't solve this problem from Codechef Long Challenge https://www.codechef.com/OCT20A/problems/DDIMMST . Can someone help me in this problem. I tried reading the editorial https://discuss.codechef.com/t/ddimmst-editorial/79385 but no help . What i don't understand is how are we able to reduce the number of edges from n^2 to 2^d*n .
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