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2 years ago
package class28;
public class Problem_0038_CountAndSay {
public static String countAndSay(int n) {
if (n < 1) {
return "";
}
if (n == 1) {
return "1";
}
char[] last = countAndSay(n - 1).toCharArray();
StringBuilder ans = new StringBuilder();
int times = 1;
for (int i = 1; i < last.length; i++) {
if (last[i - 1] == last[i]) {
times++;
} else {
ans.append(String.valueOf(times));
ans.append(String.valueOf(last[i - 1]));
times = 1;
}
}
ans.append(String.valueOf(times));
ans.append(String.valueOf(last[last.length - 1]));
return ans.toString();
}
public static void main(String[] args) {
System.out.println(countAndSay(20));
}
}