LeetCode C++ 168. Excel Sheet Column Title 和 171. Number c++ 任意进制转换器 leetcode-CSDN博客
168. Excel Sheet Column TitleGiven a positive integer, return its corresponding column title as appear in an Excel sheet.For example:1 - A2 - B3 - C...26 - Z27 - AA28 - ..._c+... 接着求X1,按照上一步的方法,需要先排除X0的影响,因此我们将等式两边同时除以R,在R进制中Xi必然小于R【Xi范围是[0, R-1]】,因此X0R0/R=0,即有Xn*Rn-1+ Xn-1Rn-2+ ...