Poison

38. Count and Say

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class Solution {
    public String countAndSay(int n) {
        String str = "1";
        for (int i = 2; i <= n; i++) {
            StringBuilder sb = new StringBuilder();

            int j = 0;
            char c = str.charAt(j);
            for (int k = j + 1; k < str.length(); k++) {
                if (str.charAt(k) != c) {
                    sb.append(k - j).append(c);
                    c = str.charAt(k);
                    j = k;
                }
            }

            sb.append(str.length() - j).append(c);
            str = sb.toString();
        }

        return str;
    }
}
Reference

38. Count and Say