(CODEFORCE)Problem-1277A. Happy Birthday, Polycarp!

import java.util.Scanner;


/**
 * Main.注意考虑到边界情况与特殊情况
 * @author : cxc
 **/
public class Main {
  public static int getTennum(int num,int len){
    String numstr = num+"";
    String mynum = "";
    for(int i=0;i<len;i++){
      mynum+=numstr;
    }
    return Integer.valueOf(mynum);
  }

  /**
   * @param num 10的倍数
   * @return
   */
  public static int caculate(int num){
    String numstr = num+"";
    int len = numstr.length();
    int result = 0;
    result += 9 * (len-1);
    //单独计算,比如len个1、2、3和4
    for(int i=1;i<=9;i++){
      if(getTennum(i,len) > num){
        break;
      }else {
        result++;
      }
    }
    return result;
  }
  //忽略末尾为p的情况
  public static void main(String[] args) {
    Scanner in = new Scanner(System.in, "utf-8");
    int n = in.nextInt();
    for (int i = 0; i < n; i++) {
      int age = in.nextInt();
      if (age < 10) {
        System.out.println(age);
      } else {
        //简化时间
        //计算num之前的所有个数
        int num = (age / 10) * 10;
        int count = caculate(num);
        //最多十个数
        for (int k = num; k <= age; k++) {
          String kstr = k + "";
          int countflag = 0;
          char[] kchar = kstr.toCharArray();
          for (int j = 1; j < kchar.length; j++) {
            if (kchar[j] != kchar[0]) {
              countflag = 1;
              break;
            }
          }
          if (countflag == 0) {
            count++;
          }
        }
        System.out.println(count);
      }
    }
    }
}
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转载自blog.csdn.net/JAck_chen0309/article/details/103630717