【第十四届蓝桥杯三月真题刷题训练——第 24 天 （3.27）& 旋转 & 附近最小 & 扫地机器人 & 窗口】

第一题：旋转

import java.util.Scanner;

public class Main {
	static int N = 300;
	static int[][] a = new int[N][N];
	static int[][] b = new int[N][N];

	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		
		int n = s.nextInt();
		int m = s.nextInt();
		
		for(int i = 1; i <= n; i++) {
			for(int j = 1; j <= m; j++) {
				a[i][j] = s.nextInt();
			}
		}
		
		for(int i = 1; i <= m; i++) {
			for(int j = 1; j <= n; j++) {
				b[i][j] = a[n-j+1][i];
			}
		}
		
		for(int i = 1; i <= m; i++) {
			for(int j = 1; j<= n; j++) {
				System.out.print(b[i][j] + " ");
			}
			System.out.println();
		}
	}

}

第二题：附近最小

第三题：扫地机器人

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Arrays;

public class Main {

    static int N = (int)1e5 + 10;
    static int[] a = new int[N];
    static int n, k;
    
    static boolean check(int x) {
        int s = 0;
        
        for(int i = 1; i <= k; i++) {
            if(a[i]-x > s) return false;
            if(a[i] <= s) s = a[i] + x - 1;
            else s += x;
        }
        return s >= n;
    }
    
    public static void main(String[] args) throws Exception{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        
        String[] s = br.readLine().split(" ");
        n = Integer.parseInt(s[0]);
        k = Integer.parseInt(s[1]);
        
        for(int i = 1; i <= k; i++) {
            a[i] = Integer.parseInt(br.readLine());
        }
        
        Arrays.sort(a, 1, k+1);
        
        int l = 0, r = n;
        while(l < r) {
            int mid = (l + r) >> 1;
            if(check(mid)) r = mid;
            else l = mid + 1;
        }
        
        System.out.println((r-1)*2);
    
    }

}

第四题：窗口