The Wiener index of a graph $G$, denoted $W(G)$, is the sum of the distances between all pairs of vertices in $G$. E. Czabarka, et al. conjectured that for an $n$-vertex, $ngeq 4$, simple quadrangulation graph $G$, begin{equation*}W(G)leq begin{cases} frac{1}{12}n^3+frac{7}{6}n-2, &text{ $nequiv 0~(mod 2)$,} frac{1}{12}n^3+frac{11}{12}n-1, &text{ $nequiv 1~(mod 2)$}. end{cases} end{equation*} In this paper, we confirm this conjecture.
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