i / j / k [terminology]

Terminology¶

Usage¶

• Use for short-lived indices with no more specific role.
• i is the primary index.
• j is a secondary or nested index.
• k is a third index or a write position when that role is obvious.
• Prefer a semantic index such as w, r, mid, or idx when it carries meaningful algorithmic behavior.

for i in range(n):
    for j in range(i + 1, n):
        nums[i], nums[j] = nums[j], nums[i]