feat: add initial implementation of 24 game solution with main function

679_24_game/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "twenty_four_game"
+version = "0.1.0"

679_24_game/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "twenty_four_game"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

679_24_game/src/main.rs

@@ -0,0 +1,65 @@
+fn main() {
+    println!("{}", Solution::judge_point24(vec![1, 5, 9, 1]));
+}
+
+struct Solution;
+
+impl Solution {
+    pub fn judge_point24(cards: Vec<i32>) -> bool {
+        let mut stack: Vec<Vec<f64>> = vec![cards.iter().map(|&v| v as f64).collect()];
+
+        while let Some(cards) = stack.pop() {
+            println!("{:?}", cards);
+
+            if cards.len() == 1 {
+                if (cards.first().unwrap() - 24f64).abs() < 1e-6 {
+                    return true;
+                } else {
+                    continue;
+                }
+            }
+
+            for i in 0..(cards.len() - 1) {
+                for j in (i + 1)..cards.len() {
+                    let a = cards[i];
+                    let b = cards[j];
+
+                    let mut left_cards = cards.clone();
+                    left_cards.remove(j);
+                    left_cards.remove(i);
+                    println!("{i} {j} {:?}", left_cards);
+
+                    let mut new_cards = left_cards.clone();
+                    new_cards.push(a + b);
+                    stack.push(new_cards);
+
+                    let mut new_cards = left_cards.clone();
+                    new_cards.push(a * b);
+                    stack.push(new_cards);
+
+                    let mut new_cards = left_cards.clone();
+                    new_cards.push(a - b);
+                    stack.push(new_cards);
+
+                    let mut new_cards = left_cards.clone();
+                    new_cards.push(b - a);
+                    stack.push(new_cards);
+
+                    if b.abs() > 1e-6 {
+                        let mut new_cards = left_cards.clone();
+                        new_cards.push(a / b);
+                        stack.push(new_cards);
+                    }
+
+                    if a.abs() > 1e-6 {
+                        let mut new_cards = left_cards.clone();
+                        new_cards.push(b / a);
+                        stack.push(new_cards);
+                    }
+                }
+            }
+        }
+
+        false
+    }
+}