  Leibniz superalgebras with nilindex $n + m$ and characteristic sequence
$(n-1, 1 \ | \ m)$ divided into four parametric classes that contain a set of
non-isomorphic superalgebras. In this paper, we give a complete classification
of solvable Leibniz superalgebras whose nilradical is a nilpotent Leibniz
superalgebra with nilindex $n + m$ and characteristic sequence $(n-1, 1 \ | \
m)$. We obtain a condition for the value of parameters of the classes of such
nilpotent superalgebras for which they have a solvable extension. Moreover, the
classification of solvable Leibniz superalgebras whose nilradical is a Lie
superalgebra with the maximal nilindex is given.
