Solution: Backtracking

Solution to the problem related to backtracking.

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Task

An addition chain for an integer nn is an increasing sequence of integers that starts with 1 and ends with nn, such that each entry after the first is the sum of two earlier entries. More formally, the integer sequence x0<x1<x2<<xlx_0 < x_1 < x_2 < ··· < x_l ...