2020, Blue Bridge Cup Provincial Tournament Javab Group Looking for 2020

tags: Algorithm Blue Bridge Cup Eleventh

Simple simulation
To the right, down, to the right

package algorithm;

import java.util.Scanner;

public class  Look for20 {

    static int N = 100000 * 4 + 5;
    static int M = 1000 + 5;
    static int mod = 1000000009;
    static Scanner cin = new Scanner(System.in);

    static int ans = 0, n, m;
    static char c[][] = new char[M][M];

    public static void main(String[] args) {
        int n1 =0;
        while(cin.hasNext()) {
            String s = cin.next();
            if ("end".equals(s))
                break;
            m = s.length();
            c[n++] = s.toCharArray();

        }
        for(int i = 0; i < n; i++){
            for(int j = 0; j < m; j++){
                if (c[i][j]=='2')
                    check(i,j);
            }
        }


        System.out.println(ans);
    }

    private static void check(int i, int j) {
        if(i + 3 < n)
            if(c[i+1][j] == '0' && c[i+2][j] == '2' && c[i+3][j] == '0')
                ++ans;
        if(j + 3 < m)
            if(c[i][j+1] == '0' && c[i][j+2] == '2' && c[i][j+3] == '0')
                ++ans;
        if(i + 3 < n && j + 3 < n)
            if(c[i+1][j+1] == '0' && c[i+2][j+2] == '2' && c[i+3][j+3] == '0')
                ++ans;
    }
}

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