蓝桥杯题解 寻找2020 Java答案

import java.util.ArrayList;
import java.util.Scanner;

public class Main {
    static Scanner s = new Scanner(System.in);
    static String string[] = new String[10005];
    static int func(char a1, char a2, char a3, char a4) {
        if(a1 == '2' && a2 == '0' && a3 == '2' && a4 == '2') {
            return 1;
        } else {
            return 0;
        }
    }
    public static void main(String[] args) throws Exception {
        int sum = 0;
        int ans = 0;
        while(s.hasNextLine()) {
            string[sum] = s.nextLine();
            if(string[sum].equals("Stop")) {
                break;
            }
            sum ++;
        }
        for(int i = 0;i < sum;i ++) {
            for(int j = 0;j < string[i].length();j ++) {
                if(i + 3 < sum) {
                    ans += func(string[i].charAt(j), string[i + 1].charAt(j), string[i + 2].charAt(j), string[i + 3].charAt(j));
                }
                if(j + 3 < string[i].length()) {
                    ans += func(string[i].charAt(j), string[i].charAt(j + 1), string[i].charAt(j + 2), string[i].charAt(j + 3));
                }
                if(i + 3 < sum && j + 3 < string[i].length()) {
                    ans += func(string[i].charAt(j), string[i + 1].charAt(j + 1), string[i + 2].charAt(j + 2), string[i + 3].charAt(j + 3));
                }
            }
        }
        System.out.println(ans);
    }
}