Trace: push(-2), push(0), push(-3), getMin(), pop(), top(), getMin().
Push -2: stack = [(-2, -2)]. Value and min both -2.
Push 0: min(0, -2) = -2. Stack = [(-2, -2), (0, -2)].
Push -3: min(-3, -2) = -3. Stack = [(-2, -2), (0, -2), (-3, -3)].
getMin(): return -3.
Pop: remove (-3, -3). Stack = [(-2, -2), (0, -2)].
Top: return 0.
getMin(): return -2 (from remaining top entry).
Each operation touches only the top. time for all operations. Store two values per element. space.