But there's a much simpler path to the solution that requires surprisingly little calculation.
但是这里有更简单的解决方法,几乎不需要进行任何计算。
英语百科
Simple path
In geometry, a simple path is a simple curve, namely, a continuous injective function from an interval in the set of real numbers to or more generally to a metric space or a topological space.
In graph theory a simple path is a path in a graph which does not have repeating vertices. See path (graph theory).