力扣题解 38th 外观数列

38th 外观数列

• 简单模拟

  根据题目描述，简单的模拟一遍即可。

  class Solution {
      public String countAndSay(int n) {
          StringBuilder sb = new StringBuilder("1");
  
          for (int k = 1; k < n; k++) {
              StringBuilder temp = new StringBuilder();
              int i = 0, j = 0;
  
              while (i < sb.length()) {
  
                  while (j < sb.length()) {
                      if (sb.charAt(i) != sb.charAt(j)) break;
                      j++;
                  }
  
                  temp.append(j - i);
                  temp.append(sb.charAt(i));
  
                  i = j;
              }
  
              sb = temp;
          }
  
          return sb.toString();
      }
  }