用计算机帮助解决ABCDE * 4 = EDCBA，一路风光无限

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Let Computer Conquer ABCDE * 4 = EDCBA, Step by Step

Hal understood the problem ABCDE * 4 = EDCBA very well. So he brought up TextEdit, probably would try something there.

“Let’s play with it in Xcode, inside a test file. And we have fix-width font by default at least. Maybe we’ll try some program solution too.”, I suggested.

“Sure”, Hal got used to unit test already.

He created a file MathTests.swift with a single function.

func testMath() {}

...

a naive solution of ABCDE * 4 = EDCBA

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