day12: cache and bool

src/day12.rs

@@ -146,13 +146,12 @@ impl PresentsProblem {
                     ) {
                         if let Some(solution) = self.place_next(new_t, cur + 1, cache) {
                             return Some(solution);
-                        } else {
-                            cache.insert((cur, t.area.clone()));
                         }
                     }
                 }
             }
         }
+        cache.insert((cur, t.area.clone()));
         None
     }
 }
@@ -237,7 +236,7 @@ mod tests {
 12x5: 1 0 1 0 3 2";
 
     #[rstest]
-    #[case(EXAMPLE, 0)]
+    #[case(EXAMPLE, 2)]
     fn part1_example(#[case] input: &str, #[case] expected: u64) {
         assert_eq!(part1(&parse(input)), expected);
     }