$\begin{aligned}
& f(x)=[x]+|x-2|,-2 < x < 3 \
& \therefore f(x)=\left{\begin{array}{l}
-x,-2 < x < -1 \
1-x,-1 \leq x < 0 \
2-x, 0 \leq x < 1 \
3-x, 1 \leq x < 2 \
x, 2 \leq x < 3
\end{array}\right.
\end{aligned}$
It is clearly discontinues at 4 points and nondifferentiable at 4 points. ∴m+n=8