题解 | #统计每个月兔子的总数#

package OnlineTest.easy;  import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.util.ArrayList; import java.util.List; import java.util.stream.Collectors;  public class HJ37 { public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));  int total = Integer.parseInt(br.readLine());  //  ArrayList<String> rabbit = new ArrayList();  List<Integer> live = new ArrayList();  //放入第一只兔子和记录它活了多久  rabbit.add("r1");  live.add(1);  //开始移动时间  for (int i = 0; i < total; i++) { for (int j=0;j<live.size();j++) { if (live.get(j) >= 3) { //生了新兔子  rabbit.add("rnew");  live.add(1);  }
            }
            live=live.stream().map(p ->(p+1)).collect(Collectors.toList());  }
        System.out.println(rabbit.size());  }
}