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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		System.out.print(decodeString("3[a]2[bc]"));
  13. 	}
  14. 	 public static String decodeString(String s) {
  15. 	 	System.out.print(s);
  16.         Stack<Character> ss = new Stack<>();
  17.         Stack<String> bb = new Stack<>();
  18.         boolean temp = false;
  19.         int n = 1;
  20.         System.out.println(n);
  21.         String resl = "";
  22.         for (Character c : s.toCharArray()) {
  23.             if (c == '[') {
  24.                 n = Integer.parseInt(""+ss.pop());//循环次数
  25.                 temp = true;
  26.             } else if (c == ']') {
  27.                 temp = false;
  28.  
  29.                 StringBuilder sb = new StringBuilder();
  30.                 StringBuilder res = new StringBuilder();
  31.                 for (String cc : bb) {
  32.                     sb.append(cc);
  33.                 }
  34.                 bb.clear();
  35.                 //sb.reverse();
  36.                 System.out.println(n);
  37.                 for (int i = 0; i < n; i++) {
  38.                     res.append(sb);
  39.                 }
  40.                 resl += res.toString();
  41.                 System.out.println(n);
  42.                 System.out.println(resl);
  43.                 n=0;
  44.             } else {
  45.                 if (temp)
  46.                     bb.push("" + c);
  47.                 else
  48.                     ss.push(  c);
  49.             }
  50.         }
  51.          return resl;
  52.  
  53.     }
  54. }
Success #stdin #stdout 0.12s 51684KB
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Standard input is empty
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3[a]2[bc]1
3
3
aaa
2
2
aaabcbc
aaabcbc
https://ideone.com/3DNNmb
language:
Java (HotSpot 12)
created:
1 day ago
visibility:
public

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