备战蓝桥杯JAVA B组Day11

前言

零基础小白备战蓝桥杯第十一天，刷题内容为：洛谷题单【入门4】数组。

P5729 【深基5.例7】工艺品制作

AC代码：

import java.util.Scanner;

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

        int w = sc.nextInt();
        int x = sc.nextInt();
        int h = sc.nextInt();

        int q = sc.nextInt();
        int [][][] a = new int[w + 1][x + 1][h + 1];

        for (int i = 0; i < q; i++) {
            int x1 = sc.nextInt();
            int y1 = sc.nextInt();
            int z1 = sc.nextInt();
            int x2 = sc.nextInt();
            int y2 = sc.nextInt();
            int z2 = sc.nextInt();

            for (int j = x1; j <= x2; j++) {
                for (int k = y1; k <= y2; k++) {
                    for (int l = z1; l <= z2; l++) {
                        a[j][k][l] = 1;
                    }
                }
            }
        }

        int count = 0;
        for (int i = 1; i <= w; i++) {
            for (int j = 1; j <= x; j++) {
                for (int k = 1; k <= h; k++) {
                    if (a[i][j][k] == 0) {
                        count++;
                    }
                }
            }
        }

        System.out.print(count);
    }
}

补充：

三维数组循环，将切割的标记，然后在循环统计未切割的个数。

P2550 [AHOI2001] 彩票摇奖

AC代码：

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int a,b;
        int[]arr = new int[34];
        int[]brr = new int[8];

        for (int i = 0; i < 7; i++) {
            a = sc.nextInt();
            arr[a] = 1;
        }

        for (int i = 0; i < n; i++) {
            int p = 0;
            for (int j = 0; j < 7; j++) {
                b = sc.nextInt();
                if(arr[b] == 1){
                    p++;
                }
            }
            brr[7-p]++;
        }
        for (int i = 0;i < 7;i++){
            System.out.print(brr[i]+" ");
        }
    }
}

补充：

循环输入小明买彩票数，再用arr[]把中奖码标为一，再输入小明彩票的号码，如果arr[小明的彩票号]=1，就多对一个号码。再使用brr[]作为几等奖的数组，注意购买的彩票中奖号码并不叠加。

P1554 梦中的统计

AC代码：

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long M = sc.nextLong();
        long N = sc.nextLong();


        int[] count = new int[10];

        for (long i = M; i <= N; i++) {
            long s = i;
            while (s > 0) {
                int digit = (int) (s % 10);
                count[digit]++;
                s /= 10;
            }
        }

        for (int i = 0; i < 10; i++) {
            System.out.print(count[i] + " ");
        }
    }
}

补充：

定义为long类型。

P2141 [NOIP2014 普及组] 珠心算测验

AC代码：

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int[] arr = new int[n];
        boolean[] brr = new boolean[n]; 
        int count = 0;
 
        for (int i = 0; i < n; i++) {
            arr[i] = sc.nextInt();
            brr[i] = false;
        }
 
        for (int i = 0; i < n; i++) {
            for (int j = i + 1; j < n; j++) {
                int sum = arr[i] + arr[j];
 
                for (int k = 0; k < n; k++) {
                    if (arr[k] == sum && !brr[k]) {
                        count++;
                        brr[k] = true;
                    }
                }
            }
        }

        System.out.println(count);
    }
}

补充：

有一个坑：例如2+3=5，1+4=5只能计算一次。所以使用两个数组，一个存储数据，一个用于判断重复。