Google – All Possible Strings


Google – All Possible Strings
Given a string that contains '', '' could be either j or k. Find out all possible strings.
[Solution]
简单题,典型backtracking咯.
但是写code的时候还是出了点小bug。backtracking的中间结果一定要想清楚再开始码代码。
Bug出在第21行。当character不是的时候,一开始写的代码在递归回来之后并没有回溯。举个例子ab就会发现,当进行到ajb的时候,递归回到处理b的那一层,如果不把b删掉,继续return到处理j的那一层,这里本意是把j删了换k,但是结果只删了b,再加上k就变成了ajk。
  public List<String> allStrings(String s) {
    List<String> result = new ArrayList<>();
    if (s == null || s.isEmpty()) {
      return result;
    }
 
    backtracking(s, 0, result, new StringBuilder());
    return result;
  }
 
  private void backtracking(String s, int pos, List<String> result, StringBuilder sb) {
    if (pos == s.length()) {
      result.add(sb.toString());
      return;
    }
 
    if (s.charAt(pos) != '*') {
      sb.append(s.charAt(pos));
      backtracking(s, pos + 1, result, sb);
      sb.deleteCharAt(sb.length() - 1);// 一定要backtrack。
    }
    else {
      sb.append("j");
      backtracking(s, pos + 1, result, sb);
      sb.deleteCharAt(sb.length() - 1);
 
      sb.append("k");
      backtracking(s, pos + 1, result, sb);
      sb.deleteCharAt(sb.length() - 1);
    }
  }
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