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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("3[a]2[bc]");
  13. 	//	System.out.print(decodeString("3[a]2[bc]"));
  14. 	}
  15. 	 public String decodeString(String s) {
  16. 	 		System.out.print(decodeString("3[a]2[bc]"));
  17.         Stack<Character> ss = new Stack<>();
  18.         Stack<String> bb = new Stack<>();
  19.         boolean temp = false;
  20.         int n = 0;
  21.         String resl = "";
  22.         for (Character c : s.toCharArray()) {
  23.             if (c == '[') {
  24.                 n = 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.                 for (int i = 0; i < n; i++) {
  37.                     res.append(sb);
  38.                 }
  39.                 resl += res.toString();
  40.                 n=0;
  41.             } else {
  42.                 if (temp)
  43.                     bb.push("" + c);
  44.                 else
  45.                     ss.push(  c);
  46.             }
  47.         }
  48.          return resl;
  49.  
  50.     }
  51. }
Success #stdin #stdout 0.07s 52472KB
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3[a]2[bc]
https://ideone.com/cnuUX7
language:
Java (HotSpot 12)
created:
1 day ago
visibility:
public

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