public class CountAndSay {
public String countAndSay(int n) {
String s = "1";
for (int i = 2; i <= n; i++) {
s = next(s);
}
return s;
}
private String next(String s) {
StringBuilder sb = new StringBuilder();
char cur = 0;
int times = 0;
for (int i = 0; i < s.length(); i++) {
if (times == 0) {
cur = s.charAt(i);
times = 1;
} else if (s.charAt(i) == cur) {
times++;
} else {
sb.append(String.format("%d%c", times, cur));
cur = s.charAt(i);
times = 1;
}
}
// 这一句千万别掉了
if (times != 0) {
sb.append(String.format("%d%c", times, cur));
}
return sb.toString();
}
}