20250812 baekjoon

code_study/Baekjoon/java/_5430.java

@@ -0,0 +1,58 @@
+import java.util.*;
+
+public class _5430 {
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        int T = Integer.parseInt(sc.nextLine());
+        
+        for(int t = 0; t<T; t++){
+            boolean invertFlag = false;
+            boolean errorFlag = false;
+            String opcode = sc.nextLine();
+            int n = Integer.parseInt(sc.nextLine());
+            String[] line = sc.nextLine().replace("[","").replace("]","").split(",");
+            Deque<Integer> arr = new LinkedList<>();
+            for(String s : line){
+                if(s.isEmpty()) break;
+                arr.add(Integer.parseInt(s));
+            }
+            
+            for(int i=0; i<opcode.length(); i++){
+                if(opcode.charAt(i) == 'R'){
+                    invertFlag = !invertFlag;
+                }
+                else if(opcode.charAt(i) == 'D'){
+                    n--;
+                    Integer temp;
+                    if(invertFlag){
+                        temp = arr.pollLast();
+                    }
+                    else {
+                        temp = arr.pollFirst();
+                    }
+                    if(temp == null){
+                        errorFlag = true;
+                        break;
+                    }
+                }
+            }
+
+            if(errorFlag){
+                System.out.println("error");
+                continue;
+            }
+
+            StringBuilder sb = new StringBuilder("[");
+            for(int ii=0; ii<n; ii++){
+                if(invertFlag)  sb.append(arr.pollLast());
+                else sb.append(arr.pollFirst());
+
+                if(ii!=n-1) sb.append(",");
+            }
+
+            sb.append("]");
+            System.out.println(sb.toString());
+        }
+        sc.close();
+    }
+}