Update: code

Author: ImSejin

src/main/java/io/github/imsejin/study/programmers/lv1/L133502.java

@@ -11,7 +11,7 @@
  */
 public class L133502 {
 
-    static int solve(int[] ingredient) {
+    static int solve0(int[] ingredient) {
         Ingredient[] ingredients = new Ingredient[ingredient.length];
         for (int i = 0; i < ingredient.length; i++) {
             ingredients[i] = Ingredient.from(ingredient[i]);
@@ -43,6 +43,25 @@ static int solve(int[] ingredient) {
         return count;
     }
 
+    static int solve1(int[] ingredient) {
+        if (ingredient.length < 4) return 0;
+
+        StringBuilder sb = new StringBuilder();
+        for (int n : ingredient) {
+            sb.append(n);
+        }
+
+        int count = 0;
+
+        int index;
+        while ((index = sb.indexOf("1231")) >= 0) {
+            count++;
+            sb.delete(index, index + 4);
+        }
+
+        return count;
+    }
+
     // -------------------------------------------------------------------------------------------------
 
     private enum Ingredient {

src/test/groovy/io/github/imsejin/study/programmers/lv1/L133502Spec.groovy

@@ -6,10 +6,11 @@ class L133502Spec extends Specification {
 
     def "test"() {
         when:
-        def actual = L133502.solve(ingredient as int[])
+        def actual = L133502.solve0(ingredient as int[])
 
         then:
         actual == expected
+        actual == L133502.solve1(ingredient as int[])
 
         where:
         ingredient                                 | expected