Compute $\operatorname{arccot} (-1).$  Express your answer in radians.
Since $\cot \left( \frac{3 \pi}{4} \right) = -1,$ $\operatorname{arccot} (-1) = \boxed{\frac{3 \pi}{4}}.$

Note: The arccot function is somewhat controversial.  Some define the range of the arccot function as $(0,\pi)$ (including the AoPS Precalculus textbook), and others define the range as $\left( -\frac{\pi}{2}, 0 \right) \cup \left( 0, \frac{\pi}{2} \right].$