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g1501_1600.s1510_stone_game_iv.readme.md Maven / Gradle / Ivy

1510\. Stone Game IV

Hard

Alice and Bob take turns playing a game, with Alice starting first.

Initially, there are `n` stones in a pile. On each player's turn, that player makes a _move_ consisting of removing **any** non-zero **square number** of stones in the pile.

Also, if a player cannot make a move, he/she loses the game.

Given a positive integer `n`, return `true` if and only if Alice wins the game otherwise return `false`, assuming both players play optimally.

**Example 1:**

**Input:** n = 1

**Output:** true

**Explanation:** Alice can remove 1 stone winning the game because Bob doesn't have any moves.

**Example 2:**

**Input:** n = 2

**Output:** false

**Explanation:** Alice can only remove 1 stone, after that Bob removes the last one winning the game (2 -> 1 -> 0).

**Example 3:**

**Input:** n = 4

**Output:** true

**Explanation:** n is already a perfect square, Alice can win with one move, removing 4 stones (4 -> 0).

**Constraints:**

*   1 <= n <= 105