Problem $2.[35$ points$]$ Moving average. Please write a C$++$ function

vector$v{m}^{th}\frac{v_m+v_{m-1}+\text{c}\text{d}\text{o}\text{t}\text{s}+v_{m-n+1}}{n}\{1\mathrm{.}0,2\mathrm{.}0,3\mathrm{.}0,4\mathrm{.}0\}n\{\frac{1\mathrm{.}0+0\mathrm{.}0}{2},\frac{2\mathrm{.}0+1\mathrm{.}0}{2},\frac{3\mathrm{.}0+2\mathrm{.}0}{2},\frac{4\mathrm{.}0+3\mathrm{.}0}{2}\}n\frac{3\mathrm{.}0+2\mathrm{.}0+1\mathrm{.}0}{3},\frac{4\mathrm{.}0+3\mathrm{.}0+2\mathrm{.}0}{3}n=2,3,4$