答案要么是对的，要么多一。。。求助

#include<bits/stdc++.h>
using namespace std;
int n,m,ans,now;
bool a[2509][2509];

template<typename T>
void read(T &x){
    x=0;int f=1;char ch=getchar();
    while(ch>'9'||ch<'0'){
        if (ch=='-') f=-1;
        ch=getchar();
    }
    while(ch>='0'&&ch<='9'){
        x=x*10+ch-'0';
        ch=getchar();
    }
    x*=f;
}
int main(){
    read(n),read(m);
    int t=1;
    for (int i=1;i<=n;i++){
        for (int j=1;j<=m;j++){
            read(a[i][j]);
        }
    }
    for (int i=1;i<=n;i++){
        for (int j=1;j<=m;j++){
            if(a[i][j]==1){
                now++;
                B:if(i+t>n||j+t>m) goto A;
                    for(int x=1;x<=t;x++){
                    for (int y=1;y<=t;y++){
                        if(a[i+x][j+y]==1&&x!=y) goto A;
                        if(x==y&&a[i+x][j+y]!=1) goto A;
                    }
                }
                now++;t++;goto B;
                A:ans=max(ans,now);
                now=0,t=1;  
            }
        }
    }
    for (int i=1;i<=n;i++){
        for (int j=m;j>=1;j--){
            if(a[i][j]==1){
                now++;
                C:if(i+t>n||j-t<1) goto D;
                    for(int x=1;x<=t;x++){
                    for (int y=1;y<=t;y++){
                        if(a[i+x][j-y]==1&&x!=y) goto D;
                        if(x==y&&a[i+x][j-y]!=1) goto D;
                    }
                }
                now++;t++;goto C;
                D:ans=max(ans,now);
                now=0,t=1;  
            }
        }
    }
    cout<<ans;
    return 0;
}   

就好比这个数据：
100 100
0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 1 0 0 0 0 0 1 1 0 0 1 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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答案是23，怎么都输出24。。。