Add operator set creation

day_07/src/main.rs

@@ -3,15 +3,39 @@
 // Run command: cargo run ./input.txt
 
 use std::{
+    collections::HashSet,
     env,
     error::Error,
     fs::File,
     io::{BufReader, prelude::*},
-    path::Component,
-    sync::RwLockWriteGuard,
 };
 
-#[derive(Debug)]
+fn create_operator_set_recurse(
+    operators_permutation_set: &mut HashSet<Vec<bool>>,
+    operators: Vec<bool>,
+) {
+    operators_permutation_set.insert(operators.clone());
+    if !operators.contains(&false) {
+        return;
+    }
+
+    for i in 0..operators.len() {
+        if operators[i] {
+            continue;
+        }
+        let mut new_operators = operators.clone();
+        new_operators[i] = true;
+        create_operator_set_recurse(operators_permutation_set, new_operators);
+    }
+}
+
+fn create_operator_set(num_of_operators: usize) -> HashSet<Vec<bool>> {
+    let mut operator_sets: HashSet<Vec<bool>> = HashSet::new();
+    create_operator_set_recurse(&mut operator_sets, vec![false; num_of_operators]);
+    operator_sets
+}
+
+#[derive(Debug, Clone, Copy)]
 enum Ops {
     Multiply,
     Add,
@@ -50,6 +74,11 @@ impl Equation {
             .collect::<Result<Vec<i32>, String>>()?;
         Ok(Equation { answer, components })
     }
+
+    fn solvable(&self) -> bool {
+        let op_combination: HashSet<HashSet<i32>> = HashSet::new();
+        false
+    }
 }
 
 fn main() -> Result<(), Box<dyn Error>> {
@@ -73,5 +102,9 @@ fn main() -> Result<(), Box<dyn Error>> {
     }
 
     println!("{:?}", equations);
+
+    let operator_set = create_operator_set(3);
+    println!("{:?}", operator_set);
+
     Ok(())
 }