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g0701_0800.s0779_k_th_symbol_in_grammar.readme.md Maven / Gradle / Ivy

779\. K-th Symbol in Grammar

Medium

We build a table of `n` rows (**1-indexed**). We start by writing `0` in the 1st row. Now in every subsequent row, we look at the previous row and replace each occurrence of `0` with `01`, and each occurrence of `1` with `10`.

*   For example, for `n = 3`, the 1st row is `0`, the 2nd row is `01`, and the 3rd row is `0110`.

Given two integer `n` and `k`, return the kth (**1-indexed**) symbol in the nth row of a table of `n` rows.

**Example 1:**

**Input:** n = 1, k = 1

**Output:** 0

**Explanation:** row 1: 0

**Example 2:**

**Input:** n = 2, k = 1

**Output:** 0

**Explanation:** row 1: 0 row 2: 01

**Example 3:**

**Input:** n = 2, k = 2

**Output:** 1

**Explanation:** row 1: 0 row 2: 01

**Constraints:**

*   `1 <= n <= 30`
*   1 <= k <= 2n - 1