CSP CCF 寻宝！大冒险！为什么得了零分

我的零分代码：

#include <iostream>
using namespace std;
int main(){
    int n,l,s;
    cin>>n>>l>>s;
    int A[l][l];
    int x[n],y[n];
    for(int i=0;i<n;i++){
        cin>>x[i]>>y[i];
        A[x[i]][y[i]]=1;
    }
    int B[s][s];
    int pi=0,qi=0;int sum0=0;
    for(int i=s;i>=0;i--){
        for(int j=0;j<=s;j++){
            int p;
            cin>>p;
            if(p==1){
                sum0++;
                B[i][j]=1;
            }
        }
    }
    int sum=0;int i=0,j=0;int sum2=1;
        while(i!=n){
            int wrong=0;
            if((x[i]+s-pi)>l){
                i++;
            }else{
            for(int p=i+1;p<n;p++){
                if(B[pi+(x[p]-x[i])][qi+(y[p]-y[i])]==1&&pi+(x[p]-x[i])>=0&&pi+(x[p]-x[i])<=s&&qi+(y[p]-y[i])>=0&&qi+(y[p]-y[i])<=s){
                    sum2++;
                }
                if(B[pi+(x[p]-x[i])][qi+(y[p]-y[i])]!=1&&pi+(x[p]-x[i])>=0&&pi+(x[p]-x[i])<=s&&qi+(y[p]-y[i])>=0&&qi+(y[p]-y[i])<=s){
                    wrong=1;
                }
            }

                if(sum2==sum0-1&&wrong!=1){
                    sum2=0;
                    sum++;
                }
            i++;
                
            }
        }
        
        cout<<sum<<endl;
        return 0; 
}