3 ms·
They're implemented like C++ vectors or Java ArrayLists. a[x] is O(1) and so is a.append. del a[x] is O(n) unless x==-1.
by MichaelSalib 15y ago
They're implemented like C++ vectors or Java ArrayLists. a[x] is O(1) and so is a.append. del a[x] is O(n) unless x==-1.