Better permutation creation

day_07/src/equation.rs

@@ -1,7 +1,11 @@
 mod operator_set;
 
+use std::collections::HashSet;
+
 use operator_set::{Op, create_operator_set};
 
+use crate::equation::operator_set::create_permutations;
+
 #[derive(Debug)]
 pub struct Equation {
     answer: i64,
@@ -63,8 +67,11 @@ impl Equation {
         accumulator
     }
 
-    pub fn solvable(&self) -> bool {
-        let op_combinations = create_operator_set(self.components.len() - 1);
+    pub fn solvable_multiply_add(&self) -> bool {
+        let op_combinations = create_permutations(
+            HashSet::from([Op::Add, Op::Multiply]),
+            self.components.len() - 1,
+        );
 
         for combination in op_combinations {
             if self.answer == self.compute_answer(&combination) {