LESSON 321 OF 349 · DYNAMIC PROGRAMMING

Binary Strings With K Ones On Even Positions in Swift

Practice O(n * k)

Given two non-negative integers N and K, return the number of binary strings of length N with exactly K ones placed only on even positions

Example:

Input: N = 6, K = 2
Output: 3
Explanation: [
    "101000",
    "100010",
    "001010"
]

Notes: 2 * K <= N <= 30

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