蓝桥杯打卡day12(3.15)

[墨离]

目录

• 1.0的个数
• 2.超级质数
• 3.卡牌

1.0的个数

import java.util.Scanner;

public class 零的个数 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long num = sc.nextLong();
        int ans = 0;
        while(num != 0){
            long m = num % 10;
            if (m == 0)ans++;
            else break;
            num /= 10;
        }
        System.out.println(ans);
    }
}

2.超级质数

这里取100000000进行循环判断，至于为什么能保证超级质数能不大于他，俺也不知

package lanqiaobei.exe.day12;

public class 超级质数 {
    public static void main(String[] args) {
        for(int i = 100000000;; i--){
            if(check(i)){
                System.out.println(i);
                break;
            }
        }
    }

    static boolean check(int num){
        String s = num + "";
        for(int i = 0; i < s.length();i ++){
            for (int j = i; j < s.length(); j ++){
                int tmp = Integer.parseInt(s.substring(i,j+1));
                if (!isPrime(tmp))return false;
            }
        }
        return true;
    }

    //判断是否是质数
    static boolean isPrime(int num){
        if(num == 1)return false;
        for(int i = 2; i <= num / i; i ++){
            if(num % i == 0)return false;
        }
        return true;

    }
}

3.卡牌

import java.io.*;
import java.util.*;

public class 卡牌 {
    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    static PrintWriter pr = new PrintWriter(new OutputStreamWriter(System.out));
    static long n,m;
    static int N = 200010;
    static long[] a = new long[N];
    static long[] b = new long[N];

    public static void main(String[] args) throws IOException {
        String[] s = br.readLine().trim().split(" ");
        n = Long.parseLong(s[0]);
        m = Long.parseLong(s[1]);
        s = br.readLine().trim().split(" ");
        //可能凑出的最大牌
        int target = Integer.MAX_VALUE;
        for (int i =0; i < n; i ++){
            a[i] = Long.parseLong(s[i]);
        }
        s = br.readLine().trim().split(" ");
        for (int i =0; i < n; i ++){
            b[i] = Long.parseLong(s[i]);
            target =(int)Math.min(a[i] + b[i],target);
        }

        int l = 1,r = target;
        while(l < r){
            int mid = l + r  + 1>> 1;
            if(check(l,r,mid))l = mid;
            else r  = mid - 1;
        }
        pr.println(r);
        pr.flush();
    }

    static boolean check(int l,int r,int mid){
        long sum = 0;
        for(int i = 0;i < n;  i++){
            long v = mid - a[i];
            if(v > 0){
                sum += v;
                if(sum > m)return false;
                continue;
            } else if(v > b[i]) return false;
        }
        return true;
    }
}