### Rust: Basic MCTS Usage Example

Source: https://github.com/loic-smetryns/simple-mcts/blob/main/README.md

This Rust code demonstrates the basic usage of the 'simple-mcts' library. It initializes an MCTS instance with a test game, performs a specified number of search iterations using a provided evaluator, retrieves the best action based on the search results, and simulates playing that action. It requires implementing 'Game' and 'GameEvaluator' traits for custom game logic.

```rust
use simple_mcts::{Mcts, test_utils::{GameTest, GameEvaluatorTest2}, MctsError};

fn main() -> Result<(), MctsError> {
    // Initialize a new MCTS instance for GameTest (a simple 4-action game)
    let mut mcts: Mcts<GameTest, 4> = Mcts::<GameTest, 4>::new();
    // Initialize a game evaluator (e.g., a machine learning model or a heuristic)
    let evaluator = GameEvaluatorTest2::new(); // test_utils provides a dummy evaluator

    // Perform MCTS iterations to build the search tree
    // Each iteration involves selection, expansion, simulation, and backpropagation
    for _ in 0..100 { // Perform 100 search iterations
        mcts.iterate(&evaluator)?;
    }

    // Get the best action based on the MCTS search results (e.g., most visited action)
    let (score, policy) = mcts.get_result();
    println!("Best action score: {}, Policy: {:?}", score, policy);

    // Simulate playing the best action in the game and update the MCTS tree
    let best_action_index = policy.iter()
                                  .enumerate()
                                  .max_by(|(_, &a), (_, &b)| a.partial_cmp(&b).unwrap())
                                  .map(|(index, _)| index)
                                  .unwrap_or(0); // Defaults to the first action if policy is empty
    mcts.play(best_action_index)?;

    println!("Game state after playing action {}", best_action_index);
    // You can now continue the MCTS search from the new game state
    // mcts.iterate(&evaluator)?;

    Ok(())
}

```

--------------------------------

### Rust: Add simple-mcts dependency to Cargo.toml

Source: https://github.com/loic-smetryns/simple-mcts/blob/main/README.md

This snippet shows how to add the 'simple-mcts' library and its dependency 'rand' to your Rust project's 'Cargo.toml' file. Ensure you check Crates.io for the latest version of 'simple-mcts'.

```toml
[dependencies]
simple-mcts = "0.1.0" # Check Crates.io for the latest version
rand = "0.9.1"

```

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