幂数

package kuaishou;

import java.util.Scanner;

//(x^y) % N
public class One {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int x = in.nextInt();
        int y = in.nextInt();
        int n = in.nextInt();

        int res = x;
        for (int i = 1; i < y; i++) {
            res = (res*x)%n;
        }

        System.out.println(res);
    }
}

二分查找

package kuaishou;

import java.util.Scanner;

public class Two {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);

        while (in.hasNext()){
            String[] str = in.nextLine().split(" ");
            int[] num = new int[str.length];
            for (int i = 0; i < num.length; i++) {
                num[i] = str[i].charAt(0)-'0';
            }
            int x = Integer.parseInt(in.nextLine());

            int low = 0;
            int high = num.length-1;

            boolean flag = false;
            for (int i = 0; i < num.length; i++) {
                if (x<=num[i]){
                    flag = true;
                    break;
                }
            }
            if (!flag){
                System.out.println(num.length);
                continue;
            }
            while (low<=high){
                int mid = (low+high)/2;
                if (num[mid]<x){
                    low = mid+1;
                }else if (num[mid]>x){
                    high = mid-1;
                }else {
                    System.out.println(mid);
                    break;
                }
                if (low>high){
                    System.out.println(mid);
                }
            }
        }
    }
}

然而我第一道题没做就交卷了,有点心累。