我的代码如下：

import java.util.*;


public class Main {
        public static int ans = 0;
    public static char[][] a = new char[30][50];
   
   
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        char[][] a = new char[30][50];
        for (int i = 0; i < 30; i++) {
                        a[i] = scanner.nextLine().toCharArray();
                }
        for (int i = 0; i < 30; i++) {
                        for (int j = 0; j < 50; j++) {
                                heng(i, j);
                                shu(i,j);
                                xie(i,j);
                        }
                }
        System.out.print(ans);
        

    }

   
   
   
    public static void heng(int i,int j) {
            for (int z = j+1; z < 50; z++) {
                        if (a[i][j]<a[i][z]) {
                                ans++;
                        }
                }

    }
   
   
    public static void shu(int i,int j) {
            for (int z = i+1; z < 30; z++) {
                        if (a[i][j]<a[z][j]) {
                                ans++;
                        }
                }
    }
   
    public static void xie(int i,int j) {
            for (int z = i+1; z < 30; z++) {
                    for (int k = j+1; k < 50; k++) {
                            if (a[i][j]<a[z][k]) {
                                    ans++;
                            }
                        }
                }
    }
}




题目：对于一个字母矩阵，我们称矩阵中的一个递增序列是指在矩阵中找到两个字母，它们在同一行，同一列，或者在同一 4545 度的斜线上，这两个字母从左向右看、或者从上向下看是递增的。

例如，如下矩阵中

LANN
QIAO
copy
有LN、LN、AN、AN、IO、AO、LQ、AI、NO、NO、AQ、IN、ANLN、LN、AN、AN、IO、AO、LQ、AI、NO、NO、AQ、IN、AN 等 1313 个 递增序列。注意当两个字母是从左下到右上排列时，从左向右看和从上向下看 是不同的顺序。

对于下面的 3030 行 5050 列的矩阵，请问总共有多少个递增序列？

数据如下
VLPWJVVNNZSWFGHSFRBCOIJTPYNEURPIGKQGPSXUGNELGRVZAG
SDLLOVGRTWEYZKKXNKIRWGZWXWRHKXFASATDWZAPZRNHTNNGQF
ZGUGXVQDQAEAHOQEADMWWXFBXECKAVIGPTKTTQFWSWPKRPSMGA
BDGMGYHAOPPRRHKYZCMFZEDELCALTBSWNTAODXYVHQNDASUFRL
YVYWQZUTEPFSFXLTZBMBQETXGXFUEBHGMJKBPNIHMYOELYZIKH
ZYZHSLTCGNANNXTUJGBYKUOJMGOGRDPKEUGVHNZJZHDUNRERBU
XFPTZKTPVQPJEMBHNTUBSMIYEGXNWQSBZMHMDRZZMJPZQTCWLR
ZNXOKBITTPSHEXWHZXFLWEMPZTBVNKNYSHCIQRIKQHFRAYWOPG
MHJKFYYBQSDPOVJICWWGGCOZSBGLSOXOFDAADZYEOBKDDTMQPA
VIDPIGELBYMEVQLASLQRUKMXSEWGHRSFVXOMHSJWWXHIBCGVIF
GWRFRFLHAMYWYZOIQODBIHHRIIMWJWJGYPFAHZZWJKRGOISUJC
EKQKKPNEYCBWOQHTYFHHQZRLFNDOVXTWASSQWXKBIVTKTUIASK
PEKNJFIVBKOZUEPPHIWLUBFUDWPIDRJKAZVJKPBRHCRMGNMFWW
CGZAXHXPDELTACGUWBXWNNZNDQYYCIQRJCULIEBQBLLMJEUSZP
RWHHQMBIJWTQPUFNAESPZHAQARNIDUCRYQAZMNVRVZUJOZUDGS
PFGAYBDEECHUXFUZIKAXYDFWJNSAOPJYWUIEJSCORRBVQHCHMR
JNVIPVEMQSHCCAXMWEFSYIGFPIXNIDXOTXTNBCHSHUZGKXFECL
YZBAIIOTWLREPZISBGJLQDALKZUKEQMKLDIPXJEPENEIPWFDLP
HBQKWJFLSEXVILKYPNSWUZLDCRTAYUUPEITQJEITZRQMMAQNLN
DQDJGOWMBFKAIGWEAJOISPFPLULIWVVALLIIHBGEZLGRHRCKGF
LXYPCVPNUKSWCCGXEYTEBAWRLWDWNHHNNNWQNIIBUCGUJYMRYW
CZDKISKUSBPFHVGSAVJBDMNPSDKFRXVVPLVAQUGVUJEXSZFGFQ
IYIJGISUANRAXTGQLAVFMQTICKQAHLEBGHAVOVVPEXIMLFWIYI
ZIIFSOPCMAWCBPKWZBUQPQLGSNIBFADUUJJHPAIUVVNWNWKDZB
HGTEEIISFGIUEUOWXVTPJDVACYQYFQUCXOXOSSMXLZDQESHXKP
FEBZHJAGIFGXSMRDKGONGELOALLSYDVILRWAPXXBPOOSWZNEAS
VJGMAOFLGYIFLJTEKDNIWHJAABCASFMAKIENSYIZZSLRSUIPCJ
BMQGMPDRCPGWKTPLOTAINXZAAJWCPUJHPOUYWNWHZAKCDMZDSR
RRARTVHZYYCEDXJQNQAINQVDJCZCZLCQWQQIKUYMYMOVMNCBVY
ABTCRRUXVGYLZILFLOFYVWFFBZNFWDZOADRDCLIRFKBFBHMAXX


请问我的代码哪里错了，只输出0