为什么D-C++上能过洛谷上RE非法内存访问？

#include<bits/stdc++.h>
using namespace std;
int i = 0, j, k, l, b[1001][1001], s, n;
int main()
{
    cin >> n;
    for(i = 1; i <= n; i++)
    {
        cin >> s;
        b[i][1] = s;
        b[i][2] = 1;
        b[i][3] = 0;
    }
    for(i = n - 1; i <= n; i--)
    {
        l = k - 0;
        for(j = i + 1; j <= n; j++)
        {
            if(b[j][i] > b[i][1] && b[j][2] > 1)
            {
                l = b[j][2];
                k = j;
            }
            if(l > 0)
            {
                b[i][2] = l + 1;
                b[i][3] = k;
            }
        }
    }
    k = 1;
    for(j = 1; j <= n; j++)
        if(b[j][2] > b[k][2])   k = j;
    cout << b[k][2] << endl;
    return 0;
}