[SWEA][D2] 1946. 간단한 압축 풀기 Java

import java.util.Scanner;  
  
public class simpleDecode {  
    public static void main(String[] args) {  
        Scanner sc = new Scanner(System.in);  
        int T;  
        T = sc.nextInt();  
  
  
        for (int test_case = 1; test_case <= T; test_case++) {  
            int num = sc.nextInt();  
            StringBuilder result = new StringBuilder();  
  
            for (int i = 0; i < num; i++) {  
                String Ci = sc.next();  
                int Ki = sc.nextInt();  
  
                for (int j = 0; j < Ki; j++) {  
                    result.append(Ci);  
                }  
            }  
  
            System.out.println("#"+test_case);  
            for (int i = 0; i < result.length(); i++) {  
                System.out.print(result.charAt(i));  
                if ( i % 10 == 9){  
                    System.out.println();  
                }  
            }  
            System.out.println();  // 마지막줄에 줄바꿈해주기
  
        }  
    }  
}